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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, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Total assets $ 7,534.4   $ 6,876.7
Total cash purchases of property and equipment 68.1 $ 69.0  
Operating Segments | Surgical Facility Services      
Segment Reporting Information [Line Items]      
Total assets 6,935.7   6,347.4
Total cash purchases of property and equipment 62.5 68.4  
Operating Segments | Ancillary Services      
Segment Reporting Information [Line Items]      
Total assets 85.1   36.3
Total cash purchases of property and equipment 1.9 0.6  
All other      
Segment Reporting Information [Line Items]      
Total assets 513.6   $ 493.0
Total cash purchases of property and equipment $ 3.7 $ 0.0