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Summary of Significant Accounting Policies - Net Operating Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Net operating revenues $ 4,801.2 $ 4,348.6 $ 4,014.9
Medicare      
Disaggregation of Revenue [Line Items]      
Net operating revenues 3,126.1 2,843.1 2,589.6
Medicare Advantage      
Disaggregation of Revenue [Line Items]      
Net operating revenues 776.1 654.6 609.6
Managed care      
Disaggregation of Revenue [Line Items]      
Net operating revenues 531.4 505.2 484.5
Medicaid      
Disaggregation of Revenue [Line Items]      
Net operating revenues 190.7 183.3 163.1
Other third-party payors      
Disaggregation of Revenue [Line Items]      
Net operating revenues 41.8 39.5 46.0
Workers’ compensation      
Disaggregation of Revenue [Line Items]      
Net operating revenues 25.8 24.7 23.1
Patients      
Disaggregation of Revenue [Line Items]      
Net operating revenues 14.9 16.6 19.3
Other income      
Disaggregation of Revenue [Line Items]      
Net operating revenues $ 94.4 $ 81.6 $ 79.7