| **Settlements - Textual (Details) (USD $)In Millions, except Share data, unless otherwise specified**                 | 12 Months Ended | 3 Months Ended | 12 Months Ended |        |        |        | 3 Months Ended | 12 Months Ended |         | 3 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------|-----------------|----------------|-----------------|--------|--------|--------|----------------|-----------------|---------|----------------|
||
| **Loss Contingencies [Line Items]**                                                                                   |            |           |            |   |   |   |           |            |    |           |   |   |   |   |   |   |   |
| Gain Related to Settlement, Audits of Unclaimed Property                                                              |            |           |            | $ 25.3 |   |   |           |            |    |           |   |   |   |   |   |   |   |
| Gain Related to Settlement, Audits of Unclaimed Property, Included in Income from Discontinued Operations, Net of Tax |            |           |            | 24.8   |   |   |           |            |    |           |   |   |   |   |   |   |   |
| Shares of Common Stock, Held by Non-Consenting Class Members                                                          |            |           |            |   |   |   |           |            | 205,000 |           |   |   |   |   |   |   |   |
| Face Value of Debt Security, Held by Non-Consenting Class Members                                                     |            |           |            |   |   |   |           |            | 1.5     |           |   |   |   |   |   |   |   |
| Settlement Agreement Consideration                                                                                    |            |           |            |   | 445    |   |           |            |    |           |   |   |   |   |   | 215 | 230 |
| Net Recoveries, Percentage Owed to Federal Plaintiffs                                                                 |            |           |            |   |   |   |           |            | 25.00%  |           |   |   |   |   |   |   |   |
| Judgment Excluded from Net Recoveries                                                                                 |            |           |            |   |   |   |           |            |    | 48             |   |   |   |   |   |   |   |
| Common Stock Shares Issued, Consolidated Securities Action Settlement                                                 |            |           |            |   |   |   |           | 5,023,732       |    |           |   |   |   |   |   |   |   |
| Common Stock Warrants Issued, Consolidated Securities Action Settlement                                               |            |           |            |   |   |   |           | 8,151,265       |    |           |   |   |   |   |   |   |   |
| Loss Contingency, Loss in Period                                                                                      |            |           |            |   |   |   | 215.0          |            |    |           |   |   |   |   |   |   |   |
| Settlement Expense, Subsequent Adjustment                                                                             |            |           |            |   |   | 37.2   |           |            |    |           |   |   |   |   |   |   |   |
| Loss Contingency, Damages Sought, Value                                                                               |            |           |            |   |   |   |           |            |    |           |   |   |   | 20 |   |   |   |
| Loss Contingency, Judgment Against Company                                                                            |            |           |            |   |   |   |           |            |    |           |   |   |   |   | 30.3 |   |   |
| Litigation Settlement, Gross                                                                                          | 0               | 0              | (100.0)         |   |   |   |           |            |    |           | 100.0 |   | 100.0 |   |   |   |   |
| Litigation Settlement, Expense                                                                                        |            |           |            |   |   |   |           |            |    |           | 26.2 |   | 26.2 |   |   |   |   |
| Proceeds from legal settlements                                                                                       |            |           |            |   |   |   |           |            |    |           | 2.1 | 97.9 |   |   |   |   |   |
| Gain (Loss) Related to Litigation Settlement                                                                          |            |           |            |   |   |   |           |            |    |           |   |   | 121.3 |   |   |   |   |
| Litigation Settlement, Gain from Accrued Interest Write-Off                                                           | $ (119.4)       | $ (125.6)      | $ (125.7)       |   |   |   |           |            |    |           |   |   | $ 9.4 |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The exact number of shares of common stock issued in full satisfaction of the Company's obligation to do so under the Consolidated Securities Action Settlement.
+ References
No definition available.
+ Details**Name:**hls_CommonStockSharesIssuedExactNumberConsolidatedSecuritiesActionSettlement**Namespace Prefix:**hls_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The exact number of common stock warrants issued by the Company in full satisfaction of its obligation to do so under the Consolidated Securities Action Settlement.
+ References
No definition available.
+ Details**Name:**hls_CommonStockWarrantsIssuedExactNumberConsolidatedSecuritiesActionSettlement**Namespace Prefix:**hls_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Face value of debt security held by an individual class member electing to be excluded from a class action settlement agreement.
+ References
No definition available.
+ Details**Name:**hls_FaceValueOfDebtSecurityHeldByNonConsentingClassMembers**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This represents the amount of income recognized in the period to settle audits of unclaimed property.
+ References
No definition available.
+ Details**Name:**hls_GainRelatedToSettlementAuditsOfUnclaimedProperty**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of income recognized in the period to settle audits of unclaimed property that is included in income from discontinued operations, net of tax.
+ References
No definition available.
+ Details**Name:**hls_GainRelatedToSettlementAuditsOfUnclaimedPropertyIncludedInIncomeFromDiscontinuedOperationsNetOfTax**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Judgment against former CEO that is excluded from net recoveries when calculating the percentage owed to plaintiffs.
+ References
No definition available.
+ Details**Name:**hls_JudgmentExcludedFromNetRecoveries**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Subsequent adjustment to initial litigation settlement expense based on the current value of the Company's common stock and the associated warrants. The original consideration for settlement was common stock and warrants issued by the Company.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Unfavorable outcome decreed by a court in a lawsuit in which the Company is involved.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of consideration to which the entity agreed to pay in a settlement agreement which resolved the matter.
+ References
No definition available.
+ Details**Name:**hls_LossContingencyLitigationSettlementConsideration**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount owed to the federal plaintiffs as part of the Consolidated Securities Action settlement agreement and expressed as a percentage of any net recoveries received from any future judgments obtained by the Company with respect to certain claims against the Company's former CEO.
+ References
No definition available.
+ Details**Name:**hls_NetRecoveriesPercentageOwedToFederalPlaintiffs**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of common stock held by individual class members electing to be excluded from a class action settlement.
+ References
No definition available.
+ Details**Name:**hls_SharesOfCommonStockHeldByNonConsentingClassMembers**Namespace Prefix:**hls_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net proceeds or assets obtained in excess of (less than) the net carrying amount of assets recorded, or assets distributed and liabilities assumed less than (in excess of) estimated litigation  liability extinguished, in settlement of a litigation matter. Represents (for other than an insurance entity in its normal claims settlement process), the amount of income (expense) recognized in the period to settle pending or threatened litigation and insurance claims.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Interest and debt related expenses associated with nonoperating financing activities of the entity.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the expenses incurred by the entity which are directly related and attributable to receiving an award in settlement of litigation.
+ References
No definition available.
+ Details**Name:**us-gaap_LitigationSettlementExpense**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the gross amount awarded, to be received by, or to be remitted to the entity in settlement of litigation occurring during the period.
+ References
No definition available.
+ Details**Name:**us-gaap_LitigationSettlementGross**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The value (monetary amount) of the award the plaintiff seeks in the legal matter.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.
+ References
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+ Details**Name:**us-gaap_LossContingencyLossInPeriod**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Cash received for the settlement of litigation during the current period.
+ References
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