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Segment Reporting - Assets and Cash Purchases of Property and Equipment by Operating Segment (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Total assets $ 6,291.6   $ 6,117.6
Total cash purchases of property and equipment 40.6 $ 28.0  
Operating Segments | Surgical Facility Services      
Segment Reporting Information [Line Items]      
Total assets 5,691.3   5,552.8
Total cash purchases of property and equipment 36.9 27.2  
Operating Segments | Ancillary Services      
Segment Reporting Information [Line Items]      
Total assets 44.5   47.5
Total cash purchases of property and equipment 0.5 0.2  
All other      
Segment Reporting Information [Line Items]      
Total assets 555.8   $ 517.3
Total cash purchases of property and equipment $ 3.2 $ 0.6