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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Total revenues $ 543.3 $ 374.7 $ 1,055.7 $ 815.7
Total patient service revenues        
Disaggregation of Revenue [Line Items]        
Total revenues $ 535.9 $ 369.1 $ 1,041.6 $ 803.7
Total patient service revenues | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Service revenues as a percentage of total revenues 100.00% 100.00% 100.00% 100.00%
Private insurance        
Disaggregation of Revenue [Line Items]        
Total revenues $ 273.0 $ 199.2 $ 519.1 $ 425.2
Private insurance | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Service revenues as a percentage of total revenues 50.90% 54.00% 49.80% 52.90%
Government        
Disaggregation of Revenue [Line Items]        
Total revenues $ 226.2 $ 140.8 $ 452.6 $ 316.6
Government | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Service revenues as a percentage of total revenues 42.20% 38.10% 43.50% 39.40%
Self-pay        
Disaggregation of Revenue [Line Items]        
Total revenues $ 17.8 $ 11.2 $ 31.0 $ 24.0
Self-pay | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Service revenues as a percentage of total revenues 3.30% 3.00% 3.00% 3.00%
Other        
Disaggregation of Revenue [Line Items]        
Total revenues $ 18.9 $ 17.9 $ 38.9 $ 37.9
Other | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Service revenues as a percentage of total revenues 3.60% 4.90% 3.70% 4.70%
Other service revenues        
Disaggregation of Revenue [Line Items]        
Total revenues $ 7.4 $ 5.6 $ 14.1 $ 12.0