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Acquisitions, Disposals and Deconsolidations - Disposals and Deconsolidations (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
surgical_facility
Dec. 31, 2023
USD ($)
surgical_facility
Dec. 31, 2022
USD ($)
business_entity
surgical_facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sales of equity investments $ 4.6 $ 1.4 $ 12.8
Loss on sale of equity method investment 10.0    
Proceeds from disposals of facilities and other assets $ 2.6 $ 25.8 12.9
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]   Gain (Loss) On Disposition Of Assets And Deconsolidation  
Surgical Facility, Equity Method Investment | Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of interests sold | surgical_facility 3    
Proceeds from sales of equity investments $ 2.6    
Loss on sale of equity method investment $ 9.5    
Surgical Facility With A Retained Interest | Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of interests sold | surgical_facility 1    
Proceeds from disposals of facilities and other assets $ 2.5    
Pre-tax gain (loss) on disposal $ 2.7    
Surgical Facility | Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of interests sold | surgical_facility 9    
Proceeds from disposals of facilities and other assets $ 5.4    
Pre-tax gain (loss) on disposal $ (14.6)    
2023 Disposals | Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of interests sold | surgical_facility   6  
Proceeds from disposals of facilities and other assets   $ 30.4  
Pre-tax gain (loss) on disposal   26.9  
Surgical Facilities and In-Development De Novo Surgical Facilities | Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sales of equity investments   1.5  
Loss on sale of equity method investment   $ 13.7  
2022 Disposals      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Pre-tax gain (loss) on disposal     $ (5.6)
2022 Disposals | Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of interests sold | surgical_facility     2
Proceeds from disposals of facilities and other assets     $ 25.7
Pre-tax gain (loss) on disposal     $ (4.5)
Disposal group, number of surgical facilities contributed as non-cash consideration | surgical_facility     2
Investment owned, fair value     $ 9.8
2022 Disposals | Disposed of by Sale | Series of Individually Immaterial Business Acquisitions      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of business entities acquired | business_entity     2