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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, 2021
Sep. 30, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Total assets $ 5,631.6   $ 5,413.2
Total cash purchases of property and equipment 43.5 $ 27.8  
Operating Segments | Surgical Facility Services      
Segment Reporting Information [Line Items]      
Total assets 5,124.4   4,962.4
Total cash purchases of property and equipment 42.0 24.1  
Operating Segments | Ancillary Services      
Segment Reporting Information [Line Items]      
Total assets 32.5   35.0
Total cash purchases of property and equipment 0.4 0.3  
All other      
Segment Reporting Information [Line Items]      
Total assets 474.7   $ 415.8
Total cash purchases of property and equipment $ 1.1 $ 3.4