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Acquisitions, Disposals and Deconsolidations - Disposals and Deconsolidations (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
facility
Dec. 31, 2022
USD ($)
facility
business_entity
Dec. 31, 2021
USD ($)
facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from disposals of facilities and other assets $ 25.8 $ 12.9 $ 6.0
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    
Four Surgical Facilities | Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of interests sold | 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 disposals of facilities and other assets 1.5    
Pre-tax gain (loss) on disposal $ (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 | facility   2  
Proceeds from disposals of facilities and other assets   $ 25.7  
Pre-tax gain (loss) on disposal   $ (4.5)  
Number of surgical facilities contributed as non-cash consideration | facility   2  
Fair value of investments   $ 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  
Disposal Group One | Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of interests sold | facility     3
Proceeds from disposals of facilities and other assets     $ 6.0
Pre-tax gain (loss) on disposal     $ 4.0