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Business Combinations - Pro Forma Results of Operation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 18 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Business Acquisition [Line Items]          
Business acquisition, pro forma revenue $ 1,295.0 $ 1,085.2 $ 2,537.2 $ 2,278.2  
Business acquisition, pro forma net income $ 113.8 $ 34.1 $ 221.9 $ 121.7  
Inpatient Rehabilitation          
Business Acquisition [Line Items]          
Business combination, pro forma information, revenue of acquiree since acquisition date, actual         $ 0.0
Business combination, pro forma information, earnings of acquiree since acquisition date, actual         0.0
Home Health and Hospice          
Business Acquisition [Line Items]          
Business combination, pro forma information, revenue of acquiree since acquisition date, actual         3.2
Business combination, pro forma information, earnings of acquiree since acquisition date, actual         $ (0.3)