| **Self-Insured Risks - Textual (Details) (USD $)In Millions, unless otherwise specified**        | 12 Months Ended |
|--------------------------------------------------------------------------------------------------|-----------------|
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| **Self Insured Risks (Textual) [Abstract]**                                                      |            |   |   |
| Maximum Self-Insured Risk                                                                        | $ 24            |   |   |
| Reserves for Professional Liability, General Liability, and Workers' Compensation Risks          | 148.3           | 153.3 |   |
| Reserves for Professional Liability, General Liability, and Workers' Compensation Risks, Current | 41.9            | 50.5 |   |
| Retained Professional and General Liability Risks, Total Costs                                   | 15.5            | 19.9 | 27.4 |
| Retained Workers' Compensation Risks, Total Costs                                                | 11.3            | 9.0 | 7.5 |
| Retained Workers' Compensation Risks, Salaries & Benefits                                    | 11.1            | 8.8 | 7.3 |
| Professional and General Liability, Excess Loss Contracts, Total Costs                           | 2.3             | 2.3 | 2.4 |
| Workers' Compensation Risks, Excess Loss Contracts, Total Costs                                  | 3.2             | 2.7 | 3.3 |
| Workers' Compensation Risks, Excess Loss Contracts, Salaries and Benefits                        | 3.2             | 2.6 | 3.2 |
| Estimated Ultimate Losses, Reductions Related to Prior Loss Periods                              | 7.5             | 4.4 | 1.7 |
| Number of Individual Claims Covered by Self-Insured Risk Reserves                                | 800             | 800 |   |
| Payments, Liability Claims, Net of Reinsurance Recoveries                                        | 24.6            | 27.0 | 30.7 |
| Reinsurance Recoveries                                                                           | 2.8             | 1.4 | 1.0 |
| Amounts Receivable Under Excess Loss Contracts                                                   | 29.8            | 35.3 |   |
| Amounts Receivable Under Excess Loss Contracts, Current                                          | $ 8.7           | $ 16.3 |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of decrease in estimated ultimate losses related to prior loss periods for the Company's professional liability, general liability, and workers' compensation risks.
+ References
No definition available.
+ Details**Name:**hls_EstimatedUltimateLossesReductionRelatedToPriorLossPeriods**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum amount that would be funded by the Company's wholly-owned captive insurance subsidiary to insure a portion of our professional liability, general liability, and workers' compensation risks through a self-insured retention program.
+ References
No definition available.
+ Details**Name:**hls_MaximumSelfInsuredRisk**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of individual claims covered by the Company's self-insured risk reserves.
+ References
No definition available.
+ Details**Name:**hls_NumberOfIndividualClaimsCoveredBySelfInsuredRiskReserves**Namespace Prefix:**hls_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Payments made during the periods presented for liability claims related to the Company's self-insured risks net of reinsurance recoveries.
+ References
No definition available.
+ Details**Name:**hls_PaymentsLiabilityClaimsNetOfReinsuranceRecoveries**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total costs incurred by the Company for premiums paid to maintain excess loss contracts with insurers and reinsurers for professional and general liability risks.
+ References
No definition available.
+ Details**Name:**hls_ProfessionalAndGeneralLiabilityExcessLossContractsTotalCosts**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Current portion of receivables currently due from reinsurers for ceded claims paid.
+ References
No definition available.
+ Details**Name:**hls_ReinsuranceReceivablesCurrent**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Receipts received from reinsurers for liabilities related to the Company's self-insured risks.
+ References
No definition available.
+ Details**Name:**hls_ReinsuranceRecoveries**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total costs incurred by the Company related to its professional and general liability self-insured risks.
+ References
No definition available.
+ Details**Name:**hls_RetainedProfessionalAndGeneralLiabilityRisksTotalCosts**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Expenses classified in salaries and benefits and associated with the Company's retained workers' compensation self-insured risks.
+ References
No definition available.
+ Details**Name:**hls_RetainedWorkersCompensationRisksSalariesAndBenefits**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total costs incurred by the Company related to its workers' compensation self-insured risks.
+ References
No definition available.
+ Details**Name:**hls_RetainedWorkersCompensationRisksTotalCosts**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**hls_SelfInsuredRisksTextualAbstract**Namespace Prefix:**hls_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Costs (classified as Salaries and Benefits) incurred by the Company for premiums paid to maintain excess loss contracts with insurers and reinsurers for workers' compensation risks.
+ References
No definition available.
+ Details**Name:**hls_WorkersCompensationRisksExcessLossContractsSalariesAndBenefits**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total costs incurred by the Company for pemiums paid to maintain excess loss contracts with insurers and reinsurers for workers' compensation risks.
+ References
No definition available.
+ Details**Name:**hls_WorkersCompensationRisksExcessLossContractsTotalCosts**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Receivables currently due from reinsurers for ceded claims paid.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 14, 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid within one year (or the normal operating cycle, if longer).
+ References
No definition available.
+ Details**Name:**us-gaap_SelfInsuranceReserveCurrent**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |