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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, 2024
Jun. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Total assets $ 7,488.6   $ 6,876.7
Total cash purchases of property and equipment 47.9 $ 50.1  
Operating Segments | Surgical Facility Services      
Segment Reporting Information [Line Items]      
Total assets 6,874.7   6,347.4
Total cash purchases of property and equipment 39.1 49.5  
Operating Segments | Ancillary Services      
Segment Reporting Information [Line Items]      
Total assets 68.1   36.3
Total cash purchases of property and equipment 1.3 0.6  
All other      
Segment Reporting Information [Line Items]      
Total assets 545.8   $ 493.0
Total cash purchases of property and equipment $ 7.5 $ 0.0