| **Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions** | Sep. 30, 2018 | May 01, 2018 | Dec. 31, 2017 |
|------------------------------------------------------------------------------------------------------------|---------------|--------------|---------------|
| **Business Acquisition [Line Items]**                                                                      |          |         |          |
| Goodwill                                                                                                   | $ 2,081.1     |         | $ 1,972.6     |
| Inpatient Rehabilitation Segment [Member] | Murrells Inlet [Member]                                        |          |         |          |
| **Business Acquisition [Line Items]**                                                                      |          |         |          |
| Goodwill                                                                                                   | 6.4           |         |          |
| Total assets acquired                                                                                      | 16.1          |         |          |
| Inpatient Rehabilitation Segment [Member] | Murrells Inlet [Member] | Noncompete agreements [Member]       |          |         |          |
| **Business Acquisition [Line Items]**                                                                      |          |         |          |
| Identifiable intangible assets                                                                             | 0.6           |         |          |
| Inpatient Rehabilitation Segment [Member] | Murrells Inlet [Member] | Trade name [Member]                  |          |         |          |
| **Business Acquisition [Line Items]**                                                                      |          |         |          |
| Identifiable intangible assets                                                                             | 1.4           |         |          |
| Inpatient Rehabilitation Segment [Member] | Murrells Inlet [Member] | Certificates of need [Member]        |          |         |          |
| **Business Acquisition [Line Items]**                                                                      |          |         |          |
| Identifiable intangible assets                                                                             | 7.7           |         |          |
| Home Health and Hospice Segment [Member] | Camellia Healthcare [Member]                                    |          |         |          |
| **Business Acquisition [Line Items]**                                                                      |          |         |          |
| Cash and cash equivalents                                                                                  |          | $ 1.3        |          |
| Prepaid expenses and other current assets                                                                  |          | 0.3          |          |
| Property and equipment, net                                                                                |          | 0.6          |          |
| Goodwill                                                                                                   |          | 97.0         |          |
| Total assets acquired                                                                                      |          | 139.3        |          |
| Accounts payable                                                                                           |          | 4.3          |          |
| Accrued payroll                                                                                            |          | 4.0          |          |
| Total liabilities assumed                                                                                  |          | 8.3          |          |
| Net assets acquired                                                                                        |          | 131.0        |          |
| Home Health and Hospice Segment [Member] | Camellia Healthcare [Member] | Noncompete agreements [Member]   |          |         |          |
| **Business Acquisition [Line Items]**                                                                      |          |         |          |
| Identifiable intangible assets                                                                             |          | 0.5          |          |
| Home Health and Hospice Segment [Member] | Camellia Healthcare [Member] | Trade name [Member]              |          |         |          |
| **Business Acquisition [Line Items]**                                                                      |          |         |          |
| Identifiable intangible assets                                                                             |          | 1.4          |          |
| Home Health and Hospice Segment [Member] | Camellia Healthcare [Member] | Certificates of need [Member]    |          |         |          |
| **Business Acquisition [Line Items]**                                                                      |          |         |          |
| Identifiable intangible assets                                                                             |          | 16.6         |          |
| Home Health and Hospice Segment [Member] | Camellia Healthcare [Member] | Licenses [Member]                |          |         |          |
| **Business Acquisition [Line Items]**                                                                      |          |         |          |
| Identifiable intangible assets                                                                             |          | $ 21.6       |          |
| Home Health and Hospice Segment [Member] | Golden Age and MSA [Member]                                     |          |         |          |
| **Business Acquisition [Line Items]**                                                                      |          |         |          |
| Goodwill                                                                                                   | 5.1           |         |          |
| Total assets acquired                                                                                      | 6.1           |         |          |
| Home Health and Hospice Segment [Member] | Golden Age and MSA [Member] | Noncompete agreements [Member]    |          |         |          |
| **Business Acquisition [Line Items]**                                                                      |          |         |          |
| Identifiable intangible assets                                                                             | 0.2           |         |          |
| Home Health and Hospice Segment [Member] | Golden Age and MSA [Member] | Licenses [Member]                 |          |         |          |
| **Business Acquisition [Line Items]**                                                                      |          |         |          |
| Identifiable intangible assets                                                                             | $ 0.8         |         |          |

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