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Segment Reporting - Assets and Cash Purchases of Property and Equipment by Operating Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Total assets $ 5,413.2 $ 5,018.9  
Cash purchases of property and equipment 42.9 73.6 $ 39.8
Operating Segments | Surgical Facility Services      
Segment Reporting Information [Line Items]      
Total assets 4,962.4 4,580.4  
Cash purchases of property and equipment 38.7 65.9 34.2
Operating Segments | Ancillary Services      
Segment Reporting Information [Line Items]      
Total assets 35.0 69.6  
Cash purchases of property and equipment 0.4 1.1 0.4
Operating Segments | Optical Services      
Segment Reporting Information [Line Items]      
Total assets 0.0 17.7  
All other      
Segment Reporting Information [Line Items]      
Total assets 415.8 351.2  
Cash purchases of property and equipment $ 3.8 $ 6.6 $ 5.2