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Business Combinations - Pro Forma Results of Operation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
2021 Acquisitions      
Business Acquisition [Line Items]      
Business acquisition, pro forma revenue $ 5,152.2 $ 4,705.2  
Business acquisition, pro forma net income (loss) 413.0 286.8  
2020 Acquisitions      
Business Acquisition [Line Items]      
Business acquisition, pro forma revenue   4,650.3 $ 4,626.0
Business acquisition, pro forma net income (loss)   284.8 360.8
2019 Acquisitions      
Business Acquisition [Line Items]      
Business acquisition, pro forma revenue     4,674.6
Business acquisition, pro forma net income (loss)     364.3
Inpatient Rehabilitation Segment      
Business Acquisition [Line Items]      
Business combination, pro forma information, revenue of acquiree since acquisition date, actual 0.0    
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual 0.0    
Inpatient Rehabilitation Segment | Portercare Adventist and Premier Health Partners      
Business Acquisition [Line Items]      
Business combination, pro forma information, revenue of acquiree since acquisition date, actual   0.0  
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual   0.0  
Inpatient Rehabilitation Segment | Saint Alphonsus and Heritage Valley      
Business Acquisition [Line Items]      
Business combination, pro forma information, revenue of acquiree since acquisition date, actual     4.4
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual     (1.3)
Home Health and Hospice      
Business Acquisition [Line Items]      
Business combination, pro forma information, revenue of acquiree since acquisition date, actual 20.6    
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual $ 0.6    
Home Health and Hospice | Alacare      
Business Acquisition [Line Items]      
Business combination, pro forma information, revenue of acquiree since acquisition date, actual     58.5
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual     1.6
Home Health and Hospice | Tidewater and Care Resource Group      
Business Acquisition [Line Items]      
Business combination, pro forma information, revenue of acquiree since acquisition date, actual     6.5
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual     $ (1.5)
Home Health and Hospice | Generation Solutions of Lynchburg      
Business Acquisition [Line Items]      
Business combination, pro forma information, revenue of acquiree since acquisition date, actual   1.5  
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual   $ 0.0