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Acquisitions and Disposals - Acquisitions (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2023
USD ($)
facility
Jun. 30, 2022
USD ($)
facility
Dec. 31, 2022
USD ($)
Business Acquisition [Line Items]      
Payments for acquisitions, net of cash acquired $ 43.5 $ 74.9  
Goodwill $ 4,235.9   $ 4,137.1
Equity Method Investments      
Business Acquisition [Line Items]      
Number of non-controlling interests in surgical facilities acquired | facility 4 5  
Number of non-controlling interests in in-development de novo surgical facilities acquired | facility 2 4  
Surgical Facility and Physician Practice      
Business Acquisition [Line Items]      
Payments for acquisitions, net of cash acquired $ 17.9    
Noncash consideration 1.3    
Recognized non-controlling interests 12.0    
Goodwill 27.4    
Surgical Facilities      
Business Acquisition [Line Items]      
Payments for acquisitions, net of cash acquired 26.9 $ 74.9  
Noncash consideration   2.6  
Recognized non-controlling interests 55.2 41.5  
Goodwill $ 106.3 $ 114.4  
Number of facilities acquired | facility 2 4  
Non-controlling interest, fair value $ 27.3    
Net (loss) gain on fair value of non-controlling interest 7.1    
Surgical Facilities, Existing Markets      
Business Acquisition [Line Items]      
Number of facilities acquired | facility   2  
Surgical Facilities and In-Development De Novo Surgical Facilities      
Business Acquisition [Line Items]      
Payments for acquisitions, net of cash acquired 48.4 $ 65.8  
Surgical Facilities and In-Development De Novo Surgical Facilities | Management rights agreement      
Business Acquisition [Line Items]      
Intangible assets acquired $ 20.0