| **Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions**    | 1 Months Ended | 6 Months Ended |           |
|---------------------------------------------------------------------------------------------------------------|----------------|----------------|-----------|
||
| **Business Acquisition [Line Items]**                                                                         |           |           |      |
| Goodwill                                                                                                      |           | $ 2,318.7      | $ 2,305.2 |
| Inpatient Rehabilitation | Portercare Adventist and Premier Health Partners                                   |           |           |      |
| **Business Acquisition [Line Items]**                                                                         |           |           |      |
| Property and equipment, net                                                                                   |           | 0.1            |      |
| Goodwill                                                                                                      |           | 9.2            |      |
| Total assets acquired                                                                                         |           | 10.9           |      |
| Inpatient Rehabilitation | Portercare Adventist and Premier Health Partners | Noncompete Agreements           |           |           |      |
| **Business Acquisition [Line Items]**                                                                         |           |           |      |
| Identifiable intangible assets                                                                                |           | 0.7            |      |
| Inpatient Rehabilitation | Portercare Adventist and Premier Health Partners | Trade Name                      |           |           |      |
| **Business Acquisition [Line Items]**                                                                         |           |           |      |
| Identifiable intangible assets                                                                                |           | $ 0.9          |      |
| Finite-lived intangible asset useful life                                                                     |           | 20 years       |      |
| Inpatient Rehabilitation | Maximum | Portercare Adventist and Premier Health Partners | Noncompete Agreements |           |           |      |
| **Business Acquisition [Line Items]**                                                                         |           |           |      |
| Finite-lived intangible asset useful life                                                                     |           | 3 years        |      |
| Inpatient Rehabilitation | Minimum | Portercare Adventist and Premier Health Partners | Noncompete Agreements |           |           |      |
| **Business Acquisition [Line Items]**                                                                         |           |           |      |
| Finite-lived intangible asset useful life                                                                     |           | 2 years        |      |
| Home Health and Hospice | Generation Solutions of Lynchburg                                                   |           |           |      |
| **Business Acquisition [Line Items]**                                                                         |           |           |      |
| Goodwill                                                                                                      | $ 1.0          |           |      |
| Total assets acquired                                                                                         | 1.1            |           |      |
| Home Health and Hospice | Generation Solutions of Lynchburg | Licensing Agreements                            |           |           |      |
| **Business Acquisition [Line Items]**                                                                         |           |           |      |
| Identifiable intangible assets                                                                                | $ 0.1          |           |      |
| Finite-lived intangible asset useful life                                                                     | 10 years       |           |      |

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| - Definition
Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| - Definition
Amount of assets acquired at the acquisition date.
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| - Definition
The amount of identifiable intangible assets recognized as of the acquisition date.
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| - Definition
The amount of property, plant, and equipment recognized as of the acquisition date.
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| - Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
+ References
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