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Organization and Summary of Accounting Policies - Schedule of Revenues by Sources (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Total revenues $ 615.4 $ 543.3 $ 1,211.6 $ 1,055.7
Patient service revenues        
Disaggregation of Revenue [Line Items]        
Total revenues $ 607.3 $ 535.9 $ 1,195.0 $ 1,041.6
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 $ 309.5 $ 273.0 $ 608.6 $ 519.1
Private insurance | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Revenue by service type as a proportion of total revenues (as a percent) 51.00% 50.90% 50.90% 49.80%
Government        
Disaggregation of Revenue [Line Items]        
Total revenues $ 258.1 $ 226.2 $ 507.0 $ 452.6
Government | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Revenue by service type as a proportion of total revenues (as a percent) 42.50% 42.20% 42.40% 43.50%
Self-pay        
Disaggregation of Revenue [Line Items]        
Total revenues $ 16.5 $ 17.8 $ 33.2 $ 31.0
Self-pay | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Revenue by service type as a proportion of total revenues (as a percent) 2.70% 3.30% 2.80% 3.00%
Other        
Disaggregation of Revenue [Line Items]        
Total revenues $ 23.2 $ 18.9 $ 46.2 $ 38.9
Other | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Revenue by service type as a proportion of total revenues (as a percent) 3.80% 3.60% 3.90% 3.70%
Other service revenues        
Disaggregation of Revenue [Line Items]        
Total revenues $ 8.1 $ 7.4 $ 16.6 $ 14.1