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Acquisitions, Disposals and Deconsolidations - Acquisitions (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
facility
physician_practice
Dec. 31, 2022
USD ($)
facility
Dec. 31, 2021
USD ($)
facility
physician_practice
Business Acquisition [Line Items]      
Total cash consideration, net of cash acquired $ 80.0 $ 146.4 $ 285.8
Goodwill $ 4,326.0 $ 4,137.1 $ 3,911.8
Equity Method Investments      
Business Acquisition [Line Items]      
Number of non-controlling interests in surgical facilities acquired | facility 5 7  
Number of non-controlling interests in in-development de novo surgical facilities acquired | facility 2 7  
Surgical Facilities      
Business Acquisition [Line Items]      
Number of business entities acquired | facility 5 7 8
Total cash consideration, net of cash acquired   $ 146.4  
Noncash consideration   5.6  
Recognized non-controlling interests   89.1  
Goodwill   271.7  
Liabilities assumed in acquisition   $ 39.4  
Physician Practices      
Business Acquisition [Line Items]      
Number of business entities acquired | physician_practice 4   2
Six Surgical Facilities      
Business Acquisition [Line Items]      
Number of business entities acquired | facility 6    
Total cash consideration, net of cash acquired $ 24.3    
Recognized non-controlling interests 84.5    
Goodwill 142.5    
Non-controlling interest, fair value 38.7    
Net loss on fair value of non-controlling interest 9.3    
Surgical Facilities, Existing Markets      
Business Acquisition [Line Items]      
Number of business entities acquired | facility   2 2
Surgical Facilities and Physician Practices      
Business Acquisition [Line Items]      
Total cash consideration, net of cash acquired 55.5   $ 285.8
Noncash consideration 1.3    
Recognized non-controlling interests 38.7   185.9
Goodwill 84.7   $ 446.1
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