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Acquisitions, Disposals and Deconsolidations (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
surgical_facility
physician_practice
Mar. 31, 2024
USD ($)
surgical_facility
Dec. 31, 2024
USD ($)
Business Acquisition [Line Items]      
Total cash consideration, net of cash acquired $ 44.0 $ 54.6  
Recognized non-controlling interests   21.2  
Goodwill and other intangible assets, net 5,126.2   $ 5,068.0
Proceeds from disposals of facilities and other assets $ 4.8 1.5  
2024 Disposals      
Business Acquisition [Line Items]      
Pre-tax gain (loss) on disposal   2.7  
Disposed of by Sale | 2024 Disposals      
Business Acquisition [Line Items]      
Proceeds from disposals of facilities and other assets   $ 1.5  
Disposed of by Sale | Surgical Facility With a Retained Interest      
Business Acquisition [Line Items]      
Number of interests sold | surgical_facility 1    
Proceeds from disposals of facilities and other assets $ 0.5    
Pre-tax gain (loss) on disposal $ (3.0)    
Disposed of by Sale | Surgical Facility      
Business Acquisition [Line Items]      
Number of interests sold | surgical_facility 2    
Proceeds from disposals of facilities and other assets $ 4.3    
Pre-tax gain (loss) on disposal 0.5    
Surgical Facilities and Physician Practices      
Business Acquisition [Line Items]      
Number of business entities acquired | surgical_facility   2  
Total cash consideration, net of cash acquired 44.0 $ 66.0  
Recognized non-controlling interests 28.0    
Goodwill and other intangible assets, net $ 70.2 77.2  
Noncash consideration   1.1  
Current liabilities   $ 11.4  
Surgical Facilities      
Business Acquisition [Line Items]      
Number of business entities acquired | surgical_facility 4    
Number of acquired non-controlling interests | surgical_facility 1    
Total cash consideration, net of cash acquired $ 3.8    
Physician Practices      
Business Acquisition [Line Items]      
Number of business entities acquired | physician_practice 1