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Segment Reporting - Assets and Cash Purchases of Property and Equipment by Operating Segment (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Total assets $ 6,536.5   $ 6,117.6
Total cash purchases of property and equipment 57.9 $ 43.5  
Operating Segments | Surgical Facility Services      
Segment Reporting Information [Line Items]      
Total assets 5,915.0   5,552.8
Total cash purchases of property and equipment 52.8 42.0  
Operating Segments | Ancillary Services      
Segment Reporting Information [Line Items]      
Total assets 42.4   47.5
Total cash purchases of property and equipment 0.4 0.4  
All other      
Segment Reporting Information [Line Items]      
Total assets 579.1   $ 517.3
Total cash purchases of property and equipment $ 4.7 $ 1.1