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Segment Reporting - Assets and Cash Purchases of Property and Equipment by Operating Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Total assets $ 6,289.5   $ 6,117.6
Total cash purchases of property and equipment 18.2 $ 14.5  
Operating Segments | Surgical Facility Services      
Segment Reporting Information [Line Items]      
Total assets 5,651.4   5,552.8
Total cash purchases of property and equipment 17.7 14.2  
Operating Segments | Ancillary Services      
Segment Reporting Information [Line Items]      
Total assets 44.6   47.5
Total cash purchases of property and equipment 0.2 0.1  
All other      
Segment Reporting Information [Line Items]      
Total assets 593.5   $ 517.3
Total cash purchases of property and equipment $ 0.3 $ 0.2