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Summary of Significant Accounting Policies - Net Operating Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]                      
Net operating revenues $ 1,137.3 $ 1,089.5 $ 1,062.5 $ 1,059.3 $ 1,042.5 $ 1,010.8 $ 1,001.7 $ 959.9 $ 4,348.6 $ 4,014.9 $ 3,566.3
Medicare                      
Disaggregation of Revenue [Line Items]                      
Net operating revenues                 2,843.1 2,589.6 2,375.6
Medicare Advantage                      
Disaggregation of Revenue [Line Items]                      
Net operating revenues                 654.6 609.6 544.9
Managed care                      
Disaggregation of Revenue [Line Items]                      
Net operating revenues                 505.2 484.5 371.4
Medicaid                      
Disaggregation of Revenue [Line Items]                      
Net operating revenues                 183.3 163.1 140.1
Other third-party payors                      
Disaggregation of Revenue [Line Items]                      
Net operating revenues                 39.5 46.0 43.0
Workers’ compensation                      
Disaggregation of Revenue [Line Items]                      
Net operating revenues                 24.7 23.1 21.5
Patients                      
Disaggregation of Revenue [Line Items]                      
Net operating revenues                 16.6 19.3 19.2
Other income                      
Disaggregation of Revenue [Line Items]                      
Net operating revenues                 $ 81.6 $ 79.7 $ 50.6