| **Investments In and Advances to Nonconsolidated Affiliates - Table 1 (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended                                                                                                            |
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| **Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]**                                      |                                                                                                                      |   |
| Net operating revenues                                                                                                           | $ 8.2us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue                                                  | $ 21.3us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue |
| Operating expenses                                                                                                               | (3.9)hls_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses                                            | (11.2)hls_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses |
| Income from continuing operations, net of tax                                                                                    | 3.9us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems | 18.5us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems |
| Net income                                                                                                                       | $ 3.9us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss                                            | $ 18.5us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss |

| X                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of operating expense reported by an equity method investment of the entity.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of income (loss) from continuing operations before extraordinary items reported by an equity method investment of the entity.
+ References
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| X                                                                                                                                                                                                               |
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) reported by an equity method investment of the entity.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.
+ References
No definition available.
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