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Organization and Summary of Accounting Policies - Revenues by Sources (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Total revenues $ 2,539.3 $ 2,225.1 $ 1,860.1
Revenue from related parties 15.7 9.3 9.9
Total patient service revenues      
Disaggregation of Revenue [Line Items]      
Total revenues $ 2,502.1 $ 2,195.0 $ 1,836.1
Total patient service revenues | Customer | Revenue      
Disaggregation of Revenue [Line Items]      
Revenue by service type as a proportion of total revenues (percent) 100.00% 100.00% 100.00%
Private insurance      
Disaggregation of Revenue [Line Items]      
Total revenues $ 1,288.0 $ 1,110.1 $ 989.9
Private insurance | Customer | Revenue      
Disaggregation of Revenue [Line Items]      
Revenue by service type as a proportion of total revenues (percent) 51.50% 50.60% 53.90%
Government      
Disaggregation of Revenue [Line Items]      
Total revenues $ 1,059.2 $ 949.9 $ 708.5
Government | Customer | Revenue      
Disaggregation of Revenue [Line Items]      
Revenue by service type as a proportion of total revenues (percent) 42.30% 43.30% 38.60%
Self-pay      
Disaggregation of Revenue [Line Items]      
Total revenues $ 65.9 $ 61.1 $ 58.5
Self-pay | Customer | Revenue      
Disaggregation of Revenue [Line Items]      
Revenue by service type as a proportion of total revenues (percent) 2.60% 2.80% 3.20%
Other      
Disaggregation of Revenue [Line Items]      
Total revenues $ 89.0 $ 73.9 $ 79.2
Other | Customer | Revenue      
Disaggregation of Revenue [Line Items]      
Revenue by service type as a proportion of total revenues (percent) 3.60% 3.30% 4.30%
Other service revenues      
Disaggregation of Revenue [Line Items]      
Total revenues $ 37.2 $ 30.1 $ 24.0