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Segment Reporting - Assets and Cash Purchases of Property and Equipment by Operating Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Total assets $ 6,975.6   $ 6,876.7
Total cash purchases of property and equipment 21.0 $ 24.3  
Operating Segments | Surgical Facility Services      
Segment Reporting Information [Line Items]      
Total assets 6,420.9   6,347.4
Total cash purchases of property and equipment 16.3 23.8  
Operating Segments | Ancillary Services      
Segment Reporting Information [Line Items]      
Total assets 60.6   36.3
Total cash purchases of property and equipment 0.0 0.5  
All other      
Segment Reporting Information [Line Items]      
Total assets 494.1   $ 493.0
Total cash purchases of property and equipment $ 4.7 $ 0.0