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Acquisitions and Disposals - Disposals (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2023
USD ($)
facility
Jun. 30, 2022
USD ($)
facility
business_entity
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Proceeds from disposals of facilities and other assets $ 26.1 $ 0.0
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 4  
Proceeds from disposals of facilities and other assets $ 30.4  
Pre-tax gain (loss) on disposals and deconsolidations 26.7  
2022 Disposals    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Pre-tax gain (loss) on disposals and deconsolidations   (5.6)
2022 Disposals | 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   11.5
Pre-tax gain (loss) on disposals and deconsolidations   $ (0.4)
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 facilities acquired | business_entity   2
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 disposals and deconsolidations $ (13.7)