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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, 2023
Jun. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Total assets $ 6,620.6   $ 6,682.1
Total cash purchases of property and equipment 50.1 $ 40.6  
Operating Segments | Surgical Facility Services      
Segment Reporting Information [Line Items]      
Total assets 6,031.2   6,001.1
Total cash purchases of property and equipment 49.5 36.9  
Operating Segments | Ancillary Services      
Segment Reporting Information [Line Items]      
Total assets 39.6   41.7
Total cash purchases of property and equipment 0.6 0.5  
All other      
Segment Reporting Information [Line Items]      
Total assets 549.8   $ 639.3
Total cash purchases of property and equipment $ 0.0 $ 3.2