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Acquisitions, Disposals and Deconsolidations - Acquisitions (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2024
USD ($)
surgical_facility
Jun. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
surgical_facility
Jun. 30, 2023
USD ($)
facility
Jun. 30, 2023
USD ($)
physician_practice
Jun. 30, 2023
USD ($)
de_novo_surgical_facility
Dec. 31, 2023
USD ($)
Business Acquisition [Line Items]              
Total cash consideration, net of cash acquired $ 264.6 $ 43.5          
Goodwill $ 4,806.3           $ 4,326.0
Equity Method Investments              
Business Acquisition [Line Items]              
Number of non-controlling interests in in-development de novo surgical facilities acquired     4     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 $ 264.6            
Noncash consideration 1.1            
Recognized non-controlling interests 290.7            
Goodwill 483.0            
Investments and advances to affiliates $ 44.6            
Surgical Facilities and Physician Practices              
Business Acquisition [Line Items]              
Number of business entities acquired       1 1    
Total cash consideration, net of cash acquired   17.9          
Noncash consideration   1.3          
Recognized non-controlling interests   12.0 $ 12.0 $ 12.0 $ 12.0 $ 12.0  
Goodwill   27.4 27.4 $ 27.4 27.4 27.4  
Two Surgical Facilities              
Business Acquisition [Line Items]              
Number of business entities acquired | facility       2      
Total cash consideration, net of cash acquired   26.9          
Recognized non-controlling interests   55.2 55.2 $ 55.2 55.2 55.2  
Goodwill   106.3 106.3 106.3 106.3 106.3  
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   48.4          
Surgical Facilities and In-Development De Novo Surgical Facilities | Management Rights Agreement              
Business Acquisition [Line Items]              
Intangible assets acquired   $ 20.0 $ 20.0 $ 20.0 $ 20.0 $ 20.0  
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 | facility       3