| **Income Taxes - Textual (Details) (USD $)In Millions, unless otherwise specified** | 12 Months Ended                                                                                                                      | 1 Months Ended                                                         |                                                                      |
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| **Income Taxes (Textual) [Abstract]**                                               |                                                                                                                                 |                                                                   |                                                                 |   |   |   |
| Net Operating Loss Carryforwards                                                    | $ 301.3us-gaap_DeferredTaxAssetsOperatingLossCarryforwards                                                                           | $ 416.5us-gaap_DeferredTaxAssetsOperatingLossCarryforwards             |                                                                 |   |   |   |
| Gross Operating Loss Carryforwards                                                  | 629.8us-gaap_OperatingLossCarryforwards                                                                                              |                                                                   |                                                                 |   |   |   |
| Excess Tax Benefit from Share-based Compensation                                    | 8.6us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense                                                    |                                                                   |                                                                 |   |   |   |
| Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount                | 7.7us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount                                                                          | 9.1us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount            | 10.5us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount         |   |   |   |
| Valuation Allowance                                                                 | 23.0us-gaap_DeferredTaxAssetsValuationAllowance                                                                                      | 30.7us-gaap_DeferredTaxAssetsValuationAllowance                        |                                                                 |   |   |   |
| Gross Unrecognized Tax Benefits                                                     | 0.9us-gaap_UnrecognizedTaxBenefits                                                                                                   | 1.1us-gaap_UnrecognizedTaxBenefits                                     | 78.0us-gaap_UnrecognizedTaxBenefits                                  |   |   | 6.0us-gaap_UnrecognizedTaxBenefits |
| Unrecognized Tax Benefits, Accrued Interest                                         | 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued                                                                 | 0.3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |   |   | 0.1us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |
| Unrecognized Tax Benefits that Would Impact Effective Tax Rate                      |                                                                                                                                 | 0.4us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate      | 76.0us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate   |   |   |   |
| Federal [Member]                                                                    |                                                                                                                                 |                                                                   |                                                                 |   |   |   |
| **Income Taxes (Textual) [Abstract]**                                               |                                                                                                                                 |                                                                   |                                                                 |   |   |   |
| Income Tax Benefit Resulting From Tax Settlement                                    |                                                                                                                                 |                                                                   |                                                                 | 115hls_IncomeTaxBenefitResultingFromTaxSettlement/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_InternalRevenueServiceIRSMember |   |   |
| Increase Net Operating Loss Carryforward, Gross                                     |                                                                                                                                 |                                                                   |                                                                 | 283hls_IncreaseDecreaseNetOperatingLossCarryforwardGross/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_InternalRevenueServiceIRSMember |   |   |
| Net Operating Loss Carryforwards                                                    | 220.4us-gaap_DeferredTaxAssetsOperatingLossCarryforwards/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_InternalRevenueServiceIRSMember    |                                                                   |                                                                 |   |   |   |
| State [Member]                                                                      |                                                                                                                                 |                                                                   |                                                                 |   |   |   |
| **Income Taxes (Textual) [Abstract]**                                               |                                                                                                                                 |                                                                   |                                                                 |   |   |   |
| Net Operating Loss Carryforwards                                                    | $ 80.9us-gaap_DeferredTaxAssetsOperatingLossCarryforwards/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_StateAndLocalJurisdictionMember   |                                                                   |                                                                 |   |   |   |
| Fairlawn Rehabilitation Hospital [Member]                                           |                                                                                                                                 |                                                                   |                                                                 |   |   |   |
| **Income Taxes (Textual) [Abstract]**                                               |                                                                                                                                 |                                                                   |                                                                 |   |   |   |
| Affiliates Ownership Percentage, Percentage Increase                                | 30.00%hls_AffiliatesOwnershipPercentagePercentageIncrease/ us-gaap_BusinessAcquisitionAxis= hls_FairlawnRehabilitationHospitalMember |                                                                   |                                                                 |   | 30.00%hls_AffiliatesOwnershipPercentagePercentageIncrease/ us-gaap_BusinessAcquisitionAxis= hls_FairlawnRehabilitationHospitalMember |   |

| X                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The percentage increase of ownership by the Company in the investee accounted for under the equity or cost methods of accounting.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Income tax benefit resulting from settlements with taxing authorities (i.e. Federal, state, foreign) of income tax claims.
+ References
No definition available.
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| - Definition
Increase (decrease) in net operating loss carryforward on a gross basis due to a tax settlement.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.
+ References
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