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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, 2021
Jun. 30, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Total assets $ 5,620.6   $ 5,413.2
Total cash purchases of property and equipment 28.0 $ 19.9  
Operating Segments | Surgical Facility Services      
Segment Reporting Information [Line Items]      
Total assets 5,021.6   4,962.4
Total cash purchases of property and equipment 27.2 16.8  
Operating Segments | Ancillary Services      
Segment Reporting Information [Line Items]      
Total assets 32.7   35.0
Total cash purchases of property and equipment 0.2 0.1  
All other      
Segment Reporting Information [Line Items]      
Total assets 566.3   $ 415.8
Total cash purchases of property and equipment $ 0.6 $ 3.0