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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, 2023
Sep. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Total assets $ 6,780.1   $ 6,682.1
Total cash purchases of property and equipment 69.0 $ 57.9  
Operating Segments | Surgical Facility Services      
Segment Reporting Information [Line Items]      
Total assets 6,183.9   6,001.1
Total cash purchases of property and equipment 68.4 52.8  
Operating Segments | Ancillary Services      
Segment Reporting Information [Line Items]      
Total assets 38.1   41.7
Total cash purchases of property and equipment 0.6 0.4  
All other      
Segment Reporting Information [Line Items]      
Total assets 558.1   $ 639.3
Total cash purchases of property and equipment $ 0.0 $ 4.7