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Acquisitions and Disposals - Disposals and Deconsolidations (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
facility
business_entity
Dec. 31, 2021
USD ($)
Dec. 31, 2021
physician_practice
Dec. 31, 2021
surgery_center
Dec. 31, 2020
USD ($)
surgery_center
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from disposals of facilities and other assets $ 12.9 $ 6.0     $ 58.5
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        
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 2   1 3 3
Proceeds from disposals of facilities and other assets $ 25.7 6.0     $ 58.5
Pre-tax gain (loss) on disposal $ (4.5) $ 4.0     5.2
Disposal Group One | Disposed of by Sale | Equity Method Investments          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of interests sold | facility 1        
Disposal Group Two          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Pre-tax gain (loss) on disposal $ (5.6)        
Disposal Group Two | Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Pre-tax gain (loss) on disposal         $ (3.5)
Number of surgical facilities contributed as non-cash consideration | facility 2        
Fair value of investments $ 9.8        
Disposal Group Two | 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