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Segment Reporting - Revenues of Operating Segments by Service Line (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net operating revenues $ 5,121.6 $ 4,644.4 $ 4,605.0
Inpatient Rehabilitation      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net operating revenues 4,015.0 3,566.2 3,513.0
Inpatient Rehabilitation | Inpatient      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net operating revenues 3,918.1 3,496.1 3,423.5
Inpatient Rehabilitation | Outpatient and other      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net operating revenues 96.9 70.1 89.5
Home Health and Hospice      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net operating revenues 1,106.6 1,078.2 1,092.0
Home Health and Hospice | Home health      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net operating revenues 897.3 877.6 918.0
Home Health and Hospice | Hospice      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net operating revenues $ 209.3 $ 200.6 $ 174.0