| **Consolidated Statement of Shareholders' Equity (USD $)In Millions, except Share data** | Total                                                                                                           | Capital in Excess of Par Value                                                                                                                                                                | Accumulated Deficit                                                                                                                                              | Accumulated Other Comprehensive Income (Loss)                                                                                                                                   | Treasury Stock                                                                                                                                                                        | Noncontrolling Interests                                                                                                                                            | Common Stock [Member]                                                                                                                                 |
|------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------|
| Balance at beginning of period at Dec. 31, 2011                                          | $ 201.0us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest                           | $ 2,874.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                         | $ (2,609.7)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember | $ (0.2)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (148.8)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                           | $ 84.6us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember   | $ 1.0us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember |
| Balance at beginning of period, shares at Dec. 31, 2011                                  |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | 95,200,000us-gaap_CommonStockSharesOutstanding/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                      |
| Net income                                                                               | 235.9us-gaap_ProfitLoss                                                                                         |                                                                                                                                                                                          | 185.0us-gaap_ProfitLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                                   |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Net income attributable to nonredeemable noncontrolling interest                         | 47.1us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest                                      |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  | 47.1us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember             |                                                                                                                                                  |
| Net income, including portion attributable to nonredeemable noncontrolling interest      | 232.1us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest                     |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Receipt of treasury stock                                                                | (11.9)hls_TreasuryStockReacquired                                                                               |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            | (11.9)hls_TreasuryStockReacquired/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                                                 |                                                                                                                                                                |                                                                                                                                                  |
| Receipt of treasury stock, shares                                                        |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | (700,000)hls_TreasurySharesReacquired/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                               |
| Dividends declared on convertible perpetual preferred stock                              | (23.9)us-gaap_DividendsPreferredStockCash                                                                       | (23.9)us-gaap_DividendsPreferredStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                                       |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Stock-based compensation                                                                 | 24.1us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue    | 24.1us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember    |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Distributions declared                                                                   | (45.4)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders                          |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  | (45.4)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember |                                                                                                                                                  |
| Capital contributions from consolidated affiliates                                       | 12.4us-gaap_PartnersCapitalAccountContributions                                                                 |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  | 12.4us-gaap_PartnersCapitalAccountContributions/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember                                        |                                                                                                                                                  |
| Consolidation of Hospital                                                                | 13.9us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination                                               |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  | 13.9us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember                      |                                                                                                                                                  |
| Other                                                                                    | 1.2us-gaap_StockholdersEquityOther                                                                              | 2.3us-gaap_StockholdersEquityOther/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                                              |                                                                                                                                                             | 1.6us-gaap_StockholdersEquityOther/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                                    | (2.6)us-gaap_StockholdersEquityOther/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                                              | (0.1)us-gaap_StockholdersEquityOther/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember                                                   |                                                                                                                                                  |
| Other, Shares                                                                            |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | 1,200,000us-gaap_StockholdersEquityOtherShares/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                      |
| Balance at end of period at Dec. 31, 2012                                                | 403.5us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest                             | 2,876.6us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                           | (2,424.7)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember   | 1.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember     | (163.3)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                             | 112.5us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember    | 1.0us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember   |
| Balance at end of period, shares at Dec. 31, 2012                                        |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | 95,700,000us-gaap_CommonStockSharesOutstanding/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                      |
| Net income                                                                               | 381.4us-gaap_ProfitLoss                                                                                         |                                                                                                                                                                                          | 323.6us-gaap_ProfitLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                                   |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Net income attributable to nonredeemable noncontrolling interest                         | 52.0us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest                                      |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  | 52.0us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember             |                                                                                                                                                  |
| Net income, including portion attributable to nonredeemable noncontrolling interest      | 375.6us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest                     |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Receipt of treasury stock                                                                | (5.8)hls_TreasuryStockReacquired                                                                                |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            | (5.8)hls_TreasuryStockReacquired/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Receipt of treasury stock, shares                                                        |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | (300,000)hls_TreasurySharesReacquired/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                               |
| Dividends declared on common stock                                                       | (32.0)us-gaap_DividendsCommonStockCash                                                                          | (32.0)us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Dividends declared on convertible perpetual preferred stock                              | (21.0)us-gaap_DividendsPreferredStockCash                                                                       | (21.0)us-gaap_DividendsPreferredStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                                       |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Stock-based compensation                                                                 | 24.8us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue    | 24.8us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember    |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Stock options exercised                                                                  | 8.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 8.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Sock options exercised, Shares                                                           |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | 300,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                   |
| Stock warrants exercised                                                                 | 15.3hls_WarrantsExercisedValue                                                                                  | 15.3hls_WarrantsExercisedValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                                                  |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Stock warrants exercised, Shares                                                         |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | 500,000hls_StockWarrantsExercisesinPeriodShares/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                     |
| Distributions declared                                                                   | (40.4)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders                          |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  | (40.4)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember |                                                                                                                                                  |
| Repurchase of common stock                                                               | (234.1)hls_TreasuryStockValueAcquiredCostMethodCommonStock                                                      |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            | (234.1)hls_TreasuryStockValueAcquiredCostMethodCommonStock/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                        |                                                                                                                                                                |                                                                                                                                                  |
| Repurchase of common stock, Shares                                                       |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | (9,100,000)us-gaap_TreasuryStockSharesAcquired/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                      |
| Repurchase of preferred stock through convertible exchange                               | (71.6)hls_TreasuryStockValueAcquiredCostMethodPreferredStock                                                    | (71.6)hls_TreasuryStockValueAcquiredCostMethodPreferredStock/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                    |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Equity portion of convertible debt                                                       | 71.0us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt                                | 71.0us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Tax impact of equity portion of convertible debt                                         | (28.0)hls_AdjustmentstoAdditionalPaidinCapitalTaxImpactOfEquityComponentofConvertibleDebt                       | (28.0)hls_AdjustmentstoAdditionalPaidinCapitalTaxImpactOfEquityComponentofConvertibleDebt/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                       |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Other                                                                                    | 3.2us-gaap_StockholdersEquityOther                                                                              | 6.1us-gaap_StockholdersEquityOther/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                                              |                                                                                                                                                             | (1.5)us-gaap_StockholdersEquityOther/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                                  | (1.4)us-gaap_StockholdersEquityOther/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                                              | 0us-gaap_StockholdersEquityOther/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember                                                       |                                                                                                                                                  |
| Other, Shares                                                                            |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | 900,000us-gaap_StockholdersEquityOtherShares/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                        |
| Balance at end of period at Dec. 31, 2013                                                | 468.7us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest                             | 2,849.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                           | (2,101.1)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember   | (0.1)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember   | (404.6)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                             | 124.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember    | 1.0us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember   |
| Balance at end of period, shares at Dec. 31, 2013                                        |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | 88,000,000us-gaap_CommonStockSharesOutstanding/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                      |
| Net income                                                                               | 281.7us-gaap_ProfitLoss                                                                                         |                                                                                                                                                                                          | 222.0us-gaap_ProfitLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                                   |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Net income attributable to nonredeemable noncontrolling interest                         | 53.1us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest                                      |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  | 53.1us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember             |                                                                                                                                                  |
| Net income, including portion attributable to nonredeemable noncontrolling interest      | 275.1us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest                     |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Receipt of treasury stock                                                                | (9.7)hls_TreasuryStockReacquired                                                                                |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            | (9.7)hls_TreasuryStockReacquired/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Receipt of treasury stock, shares                                                        |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | (300,000)hls_TreasurySharesReacquired/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                               |
| Dividends declared on common stock                                                       | (69.0)us-gaap_DividendsCommonStockCash                                                                          | (69.0)us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Dividends declared on convertible perpetual preferred stock                              | (6.3)us-gaap_DividendsPreferredStockCash                                                                        | (6.3)us-gaap_DividendsPreferredStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                                        |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Stock-based compensation                                                                 | 23.9us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue    | 23.9us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember    |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Stock options exercised                                                                  | 7.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 7.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember |                                                                                                                                                             |                                                                                                                                                                            | (0.1)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember |                                                                                                                                                                |                                                                                                                                                  |
| Sock options exercised, Shares                                                           | 290,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised                                               |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | 300,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                   |
| Stock warrants exercised                                                                 | 6.3hls_WarrantsExercisedValue                                                                                   | 6.3hls_WarrantsExercisedValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                                                   |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                |                                                                                                                                                  |
| Stock warrants exercised, Shares                                                         |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | 200,000hls_StockWarrantsExercisesinPeriodShares/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                     |
| Distributions declared                                                                   | (44.9)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders                          |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  | (44.9)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember |                                                                                                                                                  |
| Repurchase of common stock                                                               | (43.1)hls_TreasuryStockValueAcquiredCostMethodCommonStock                                                       |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            | (43.1)hls_TreasuryStockValueAcquiredCostMethodCommonStock/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                         |                                                                                                                                                                |                                                                                                                                                  |
| Repurchase of common stock, Shares                                                       |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | (1,300,000)us-gaap_TreasuryStockSharesAcquired/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                      |
| Consolidation of Hospital                                                                | 14.0us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination                                               |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  | 14.0us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember                      |                                                                                                                                                  |
| Other                                                                                    | (2.9)us-gaap_StockholdersEquityOther                                                                            | (1.3)us-gaap_StockholdersEquityOther/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                                            |                                                                                                                                                             | (0.4)us-gaap_StockholdersEquityOther/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                                  | (1.2)us-gaap_StockholdersEquityOther/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                                              | 0us-gaap_StockholdersEquityOther/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember                                                       |                                                                                                                                                  |
| Other, Shares                                                                            |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | 900,000us-gaap_StockholdersEquityOtherShares/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                        |
| Balance at end of period at Dec. 31, 2014                                                | $ 619.5us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest                           | $ 2,810.5us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                         | $ (1,879.1)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember | $ (0.5)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (458.7)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                           | $ 146.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember  | $ 1.0us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember |
| Balance at end of period, shares at Dec. 31, 2014                                        |                                                                                                            |                                                                                                                                                                                          |                                                                                                                                                             |                                                                                                                                                                            |                                                                                                                                                                                  |                                                                                                                                                                | 87,800,000us-gaap_CommonStockSharesOutstanding/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                      |

| X                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase (decrease) in additional paid in capital (APIC) resulting from recognition of deferred taxes for convertible debt.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The stock warrants exercises resulted in the issuance of shares of common stock.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of common stock shares reacquired during the period and currently held in treasury.
+ References
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| X                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Value of common stock reacquired during the period and currently held in treasury.
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| X                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the cost of common stock that were repurchased during the period. Recorded using the cost method.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the cost of preferred stock that were repurchased during the period. Recorded using the cost method.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Value of stock issued as a result of the exercise of stock warrants.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Portion of net income (loss) attributable to nonredeemable noncontrolling interest.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after income tax of income (loss) including the portion attributable to nonredeemable noncontrolling interest. Excludes the portion attributable to redeemable noncontrolling interest recognized as temporary equity.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Increase in noncontrolling interest balance because of a business combination that occurred during the period.
+ References
No definition available.
+ Details**Name:**us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total contributions made by each class of partners (i.e., general, limited and preferred partners).
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.
+ References
No definition available.
+ Details**Name:**us-gaap_StockholdersEquityOther**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents movements in the number of shares included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.
+ References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of share options (or share units) exercised during the current period.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares that have been repurchased during the period and are being held in treasury.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5
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