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Acquisitions, Disposals and Deconsolidations - Acquisitions (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
surgical_facility
Dec. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
surgical_facility
Dec. 31, 2023
USD ($)
physician_practice
Dec. 31, 2023
USD ($)
de_novo_surgical_facility
Dec. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
surgical_facility
Dec. 31, 2022
USD ($)
de_novo_surgical_facility
Business Acquisition [Line Items]                
Total cash consideration, net of cash acquired $ 378.8 $ 80.0       $ 146.4    
Goodwill $ 5,068.0 4,326.0 $ 4,326.0 $ 4,326.0 $ 4,326.0 4,137.1 $ 4,137.1 $ 4,137.1
Equity Method Investments                
Business Acquisition [Line Items]                
Number of non-controlling interests in in-development de novo surgical facilities acquired     5   2   7 7
Surgical Facilities and Anesthesia Practice                
Business Acquisition [Line Items]                
Number of business entities acquired | surgical_facility 8              
Total cash consideration, net of cash acquired $ 378.8              
Noncash consideration 1.1              
Recognized non-controlling interests 478.9              
Goodwill 767.7              
Investments and advances to affiliates $ 44.6              
Surgical Facilities, Physician Practices, And In-Development Denovo Surgical Facility                
Business Acquisition [Line Items]                
Number of business entities acquired     5 4        
Total cash consideration, net of cash acquired   55.5            
Noncash consideration   1.3            
Recognized non-controlling interests   38.7 $ 38.7 $ 38.7 $ 38.7      
Goodwill   84.7 $ 84.7 84.7 84.7      
Surgical Facilities And In-Development De Novo Surgical Facility                
Business Acquisition [Line Items]                
Number of business entities acquired | surgical_facility     6          
Total cash consideration, net of cash acquired   24.3            
Recognized non-controlling interests   84.5 $ 84.5 84.5 84.5      
Goodwill   142.5 142.5 142.5 142.5      
Non-controlling interest, fair value   38.7            
Net loss on fair value of non-controlling interest   9.3            
Surgical Facilities and In-Development De Novo Surgical Facilities                
Business Acquisition [Line Items]                
Total cash consideration, net of cash acquired   50.3       95.1    
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          
Surgical Facilities Existing Markets                
Business Acquisition [Line Items]                
Number of business entities acquired | surgical_facility             2  
Surgical Facilities                
Business Acquisition [Line Items]                
Number of business entities acquired | surgical_facility             7  
Total cash consideration, net of cash acquired           146.4    
Noncash consideration           5.6    
Recognized non-controlling interests           89.1 $ 89.1 $ 89.1
Goodwill           271.7 $ 271.7 $ 271.7
Business combination, consideration transferred, liabilities incurred           $ 39.4