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Business Combinations - Pro Forma Results of Operation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Business acquisition, pro forma revenue $ 4,650.3 $ 4,626.0 $ 4,337.4 $ 4,039.9
Business acquisition, pro forma net income (loss) 284.8 360.8 300.0 $ 289.0
2019 Acquisitions        
Business Acquisition [Line Items]        
Business acquisition, pro forma revenue   4,674.6    
Business acquisition, pro forma net income (loss)   364.3    
2018 Acquisitions        
Business Acquisition [Line Items]        
Business acquisition, pro forma revenue     4,415.9  
Business acquisition, pro forma net income (loss)     301.8  
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)    
Inpatient Rehabilitation Segment | Tidelands Health, Novant Health, Portercare Adventist Health        
Business Acquisition [Line Items]        
Business combination, pro forma information, revenue of acquiree since acquisition date, actual     9.1  
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual     (1.6)  
Home Health and Hospice | Portercare Adventist and Premier Health Partners        
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      
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 | Camellia Healthcare        
Business Acquisition [Line Items]        
Business combination, pro forma information, revenue of acquiree since acquisition date, actual     50.0  
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual     (0.9)  
Home Health and Hospice | Golden Age Hospice, Medical Services Of America, Tenet Hospital        
Business Acquisition [Line Items]        
Business combination, pro forma information, revenue of acquiree since acquisition date, actual     3.5  
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual     $ (0.3)