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Acquisitions, Disposals and Deconsolidations - Acquisitions (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2024
USD ($)
facility
Mar. 31, 2023
USD ($)
facility
physician_practice
Dec. 31, 2023
USD ($)
Business Acquisition [Line Items]      
Total cash consideration, net of cash acquired $ 54.6 $ 40.7  
Goodwill and other intangible assets, net $ 4,397.5   $ 4,326.0
Equity Method Investments      
Business Acquisition [Line Items]      
Number of non-controlling interests in surgical facilities acquired | facility   1  
Number of non-controlling interests in in-development de novo surgical facilities acquired | facility   1  
Surgical Facilities      
Business Acquisition [Line Items]      
Number of business entities acquired | facility 2 1  
Surgical Facilities and Physician Practices      
Business Acquisition [Line Items]      
Total cash consideration, net of cash acquired $ 66.0 $ 16.2  
Noncash consideration 1.1 1.3  
Current liabilities 11.4    
Recognized non-controlling interests 21.2 12.0  
Goodwill and other intangible assets, net $ 77.2 $ 25.7  
Physician Practices      
Business Acquisition [Line Items]      
Number of business entities acquired | physician_practice   1  
Two Surgical Facilities      
Business Acquisition [Line Items]      
Number of business entities acquired | facility   2  
Total cash consideration, net of cash acquired   $ 24.5  
Recognized non-controlling interests   34.2  
Goodwill and other intangible assets, net   65.6  
Non-controlling interest, fair value   8.3  
Net loss on fair value of non-controlling interest   2.9  
Surgical Facilities and In-Development De Novo Surgical Facilities      
Business Acquisition [Line Items]      
Total cash consideration, net of cash acquired   $ 12.4