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Acquisitions, Disposals and Deconsolidations (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
surgical_facility
physician_practice
Sep. 30, 2024
USD ($)
surgical_facility
Dec. 31, 2024
USD ($)
Business Combination [Line Items]      
Total cash consideration, net of cash acquired $ 52.6 $ 291.2  
Goodwill and other intangible assets, net 5,091.6   $ 5,068.0
Proceeds from disposals of facilities and other assets 42.9 1.5  
Proceeds from sales of equity investments $ 0.0 4.0  
Loss on sale of equity method investment   $ 10.0  
Disposed of by Sale | Surgical Facility With a Retained Interest      
Business Combination [Line Items]      
Number of interests sold | surgical_facility 1 1  
Proceeds from disposals of facilities and other assets $ 0.5 $ 2.5  
Pre-tax gain (loss) on disposal $ (2.7) $ 2.7  
Disposed of by Sale | Surgical Facility      
Business Combination [Line Items]      
Number of interests sold | surgical_facility 2 1  
Proceeds from disposals of facilities and other assets $ 42.4    
Pre-tax gain (loss) on disposal 6.0 $ (3.4)  
Disposed of by Sale | Surgical Facility, Equity Method Investment      
Business Combination [Line Items]      
Number of interests sold | surgical_facility   1  
Proceeds from sales of equity investments   $ 2.0  
Loss on sale of equity method investment   $ 3.7  
Surgical Facilities and Physician Practices      
Business Combination [Line Items]      
Number of business entities acquired | surgical_facility   6  
Total cash consideration, net of cash acquired 52.6 $ 291.2  
Noncash consideration 2.3 1.1  
Recognized non-controlling interests 28.6 293.2  
Goodwill and other intangible assets, net $ 78.6 506.7  
Investments and advances to affiliates   $ 44.6  
Surgical Facilities      
Business Combination [Line Items]      
Number of business entities acquired | surgical_facility 4    
Total cash consideration, net of cash acquired $ 13.4    
Number of acquired non-controlling interests | surgical_facility 3    
Physician Practices      
Business Combination [Line Items]      
Number of business entities acquired | physician_practice 5