| **Segment Reporting - Segment Reporting Information, Reconciliation of Net Operating Revenues to Segment Adjusted EBITDA (Details) - USD ($) $ in Millions** | 3 Months Ended | 6 Months Ended |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Segment Reporting Information [Line Items]**                                                                                                               |           |           |   |   |
| Net operating revenues                                                                                                                                       | $ 1,074.1      | $ 1,135.0      | $ 2,256.1 | $ 2,259.0 |
| **Operating expenses:**                                                                                                                                      |           |           |   |   |
| Salaries and benefits                                                                                                                                        | 651.9          | 622.9          | 1,331.0 | 1,243.7 |
| Other operating expenses                                                                                                                                     | 148.3          | 149.8          | 307.9 | 299.9 |
| Supplies                                                                                                                                                     | 50.6           | 41.7           | 96.3 | 81.8 |
| Occupancy costs                                                                                                                                              | 20.3           | 20.3           | 40.5 | 39.9 |
| Total operating expenses                                                                                                                                     | 974.8          | 964.5          | 1,976.6 | 1,901.0 |
| Other income                                                                                                                                                 | (5.8)          | (2.2)          | (3.9) | (5.9) |
| Equity in net income of nonconsolidated affiliates                                                                                                           | (0.7)          | (1.8)          | (1.5) | (4.3) |
| Noncontrolling interests                                                                                                                                     | 14.8           | 19.7           | 36.5 | 42.6 |
| Inpatient Rehabilitation                                                                                                                                     |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                                                                               |           |           |   |   |
| Net operating revenues                                                                                                                                       | 824.5          | 873.9          | 1,733.7 | 1,744.0 |
| Home Health and Hospice                                                                                                                                      |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                                                                               |           |           |   |   |
| Net operating revenues                                                                                                                                       | 249.6          | 261.1          | 522.4 | 515.0 |
| Operating Segments                                                                                                                                           |           |           |   |   |
| **Operating expenses:**                                                                                                                                      |           |           |   |   |
| Segment Adjusted EBITDA                                                                                                                                      | 195.3          | 283.0          | 451.8 | 559.3 |
| Operating Segments | Inpatient Rehabilitation                                                                                                                |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                                                                               |           |           |   |   |
| Net operating revenues                                                                                                                                       | 824.5          | 873.9          | 1,733.7 | 1,744.0 |
| **Operating expenses:**                                                                                                                                      |           |           |   |   |
| Salaries and benefits                                                                                                                                        | 451.4          | 443.6          | 933.7 | 888.6 |
| Other operating expenses                                                                                                                                     | 124.3          | 127.2          | 259.0 | 254.8 |
| Supplies                                                                                                                                                     | 42.0           | 36.7           | 81.6 | 72.3 |
| Occupancy costs                                                                                                                                              | 15.4           | 16.3           | 30.7 | 32.1 |
| Total operating expenses                                                                                                                                     | 633.1          | 623.8          | 1,305.0 | 1,247.8 |
| Other income                                                                                                                                                 | (3.4)          | (1.9)          | (1.8) | (4.7) |
| Equity in net income of nonconsolidated affiliates                                                                                                           | (0.6)          | (1.4)          | (1.2) | (3.5) |
| Noncontrolling interests                                                                                                                                     | 15.1           | 19.5           | 35.9 | 40.5 |
| Segment Adjusted EBITDA                                                                                                                                      | 180.3          | 233.9          | 395.8 | 463.9 |
| Capital expenditures                                                                                                                                         | 88.9           | 92.0           | 172.2 | 162.4 |
| Operating Segments | Home Health and Hospice                                                                                                                 |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                                                                               |           |           |   |   |
| Net operating revenues                                                                                                                                       | 249.6          | 261.1          | 522.4 | 515.0 |
| **Operating expenses:**                                                                                                                                      |           |           |   |   |
| Cost of services sold (excluding depreciation and amortization)                                                                                              | 136.7          | 119.9          | 267.6 | 236.4 |
| Support and overhead costs                                                                                                                                   | 98.3           | 89.7           | 198.5 | 178.5 |
| Total operating expenses                                                                                                                                     | 235.0          | 209.6          | 466.1 | 414.9 |
| Other income                                                                                                                                                 | 0.0            | 0.0            | 0.0 | 0.0 |
| Equity in net income of nonconsolidated affiliates                                                                                                           | (0.1)          | (0.4)          | (0.3) | (0.8) |
| Noncontrolling interests                                                                                                                                     | (0.3)          | 2.8            | 0.6 | 5.5 |
| Segment Adjusted EBITDA                                                                                                                                      | 15.0           | 49.1           | 56.0 | 95.4 |
| Capital expenditures                                                                                                                                         | $ 0.6          | $ 3.5          | $ 2.1 | $ 8.0 |

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