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Acquisitions, Disposals and Deconsolidations - Acquisitions (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2024
USD ($)
surgical_facility
Sep. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
surgical_facility
Sep. 30, 2023
USD ($)
physician_practice
Sep. 30, 2023
USD ($)
de_novo_surgical_facility
Dec. 31, 2023
USD ($)
Business Acquisition [Line Items]            
Total cash consideration, net of cash acquired $ 291.2 $ 48.8        
Goodwill $ 4,815.4         $ 4,326.0
Equity Method Investments            
Business Acquisition [Line Items]            
Number of non-controlling interests in in-development de novo surgical facilities acquired     5   2  
Surgical Facilities and Anesthesia Practice            
Business Acquisition [Line Items]            
Number of business entities acquired | surgical_facility 6          
Total cash consideration, net of cash acquired $ 291.2          
Noncash consideration 1.1          
Recognized non-controlling interests 293.2          
Goodwill 506.7          
Investments and advances to affiliates $ 44.6          
Surgical Facilities and Physician Practices            
Business Acquisition [Line Items]            
Number of business entities acquired     2 1    
Total cash consideration, net of cash acquired   23.1        
Noncash consideration   1.3        
Recognized non-controlling interests   20.4 $ 20.4 $ 20.4 $ 20.4  
Goodwill   39.7 $ 39.7 39.7 $ 39.7  
Surgical Facilities And In-Development De Novo Surgical Facility            
Business Acquisition [Line Items]            
Number of business entities acquired     2   1  
Total cash consideration, net of cash acquired   26.9        
Recognized non-controlling interests   55.1 $ 55.1 55.1 $ 55.1  
Goodwill   106.3 106.3 106.3 106.3  
Non-controlling interest, fair value   27.3        
Net loss on fair value of non-controlling interest   7.1        
Surgical Facilities and In-Development De Novo Surgical Facilities            
Business Acquisition [Line Items]            
Total cash consideration, net of cash acquired   50.2        
Surgical Facilities and In-Development De Novo Surgical Facilities | Management Rights Agreement            
Business Acquisition [Line Items]            
Intangible assets acquired   $ 21.0 $ 21.0 $ 21.0 $ 21.0  
Surgical Facilities and In-Development De Novo Surgical Facilities | Equity Method Investments | Management Rights Agreement            
Business Acquisition [Line Items]            
Number of non-controlling interests in surgical facilities acquired | surgical_facility     4