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Business Combinations - Pro Forma Results of Operation (Details) - USD ($)
$ in Millions
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]            
Business acquisition, pro forma revenue     $ 4,674.6 $ 4,415.9    
Business acquisition, pro forma net income (loss)     364.3 301.8    
2017 Acquisitions            
Business Acquisition [Line Items]            
Business acquisition, pro forma revenue         $ 4,039.9  
Business acquisition, pro forma net income (loss)         289.0  
2018 Acquisitions            
Business Acquisition [Line Items]            
Business acquisition, pro forma revenue       4,337.4    
Business acquisition, pro forma net income (loss)       300.0    
2016 Acquisitions            
Business Acquisition [Line Items]            
Business combination, pro forma information, revenue of acquiree since acquisition date, actual         32.9  
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual         (6.3)  
Business acquisition, pro forma revenue         3,996.1 $ 3,771.5
Business acquisition, pro forma net income (loss)         $ 260.3 $ 254.8
Inpatient Rehabilitation Segment | 2018 Acquisitions            
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)          
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 Segment | 2018 Acquisitions            
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)    
Home Health and Hospice Segment | 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 Segment | 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 Segment | 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)