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Acquisitions and Disposals - Acquisitions (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
surgical_facility
physician_practice
Dec. 31, 2019
USD ($)
surgical_facility
physician_practice
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]      
Total cash consideration, net of cash acquired $ 104.6 $ 13.8 $ 106.8
Number of surgical facilities acquired | surgical_facility   4  
Cash investment for purchase of equity investment 0.0 $ 15.2 $ 0.0
Surgical Facility and Physician Practice      
Business Acquisition [Line Items]      
Total aggregate consideration 120.1 27.4  
Total cash consideration, net of cash acquired 104.6 20.1  
Noncash consideration 8.7    
Contingent consideration 0.7    
Additional cash consideration from working capital settlement payment $ 0.8    
Surgical Facility and Physician Practice | Previously Reported      
Business Acquisition [Line Items]      
Total aggregate consideration   $ 26.7  
Surgical Facilities, Including Surgical Hospital      
Business Acquisition [Line Items]      
Number of business entities acquired | surgical_facility 3    
Surgical Facilities, Existing Markets      
Business Acquisition [Line Items]      
Number of business entities acquired | surgical_facility 5 1  
Physician Practice      
Business Acquisition [Line Items]      
Number of business entities acquired | physician_practice 1 1