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Organization and Summary of Accounting Policies - Schedule of Revenues by Sources (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Total revenues $ 620.6 $ 559.2 $ 1,832.2 $ 1,614.9
Patient service revenues        
Disaggregation of Revenue [Line Items]        
Total revenues $ 610.1 $ 551.4 $ 1,805.1 $ 1,593.0
Patient service revenues | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Revenue by service type as a proportion of total revenues (as a percent) 100.00% 100.00% 100.00% 100.00%
Private insurance        
Disaggregation of Revenue [Line Items]        
Total revenues $ 301.9 $ 271.4 $ 910.5 $ 790.5
Private insurance | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Revenue by service type as a proportion of total revenues (as a percent) 49.50% 49.20% 50.40% 49.60%
Government        
Disaggregation of Revenue [Line Items]        
Total revenues $ 269.5 $ 248.0 $ 776.5 $ 700.6
Government | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Revenue by service type as a proportion of total revenues (as a percent) 44.20% 45.00% 43.00% 44.00%
Self-pay        
Disaggregation of Revenue [Line Items]        
Total revenues $ 16.0 $ 15.9 $ 49.2 $ 46.9
Self-pay | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Revenue by service type as a proportion of total revenues (as a percent) 2.60% 2.90% 2.70% 2.90%
Other        
Disaggregation of Revenue [Line Items]        
Total revenues $ 22.7 $ 16.1 $ 68.9 $ 55.0
Other | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Revenue by service type as a proportion of total revenues (as a percent) 3.70% 2.90% 3.90% 3.50%
Other service revenues        
Disaggregation of Revenue [Line Items]        
Total revenues $ 10.5 $ 7.8 $ 27.1 $ 21.9