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Organization and Summary of Accounting Policies - Schedule of Revenues by Sources (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Total revenues $ 596.2 $ 512.4
Patient service revenues    
Disaggregation of Revenue [Line Items]    
Total revenues $ 587.7 $ 505.7
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%
Private insurance    
Disaggregation of Revenue [Line Items]    
Total revenues $ 300.2 $ 246.1
Private insurance | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (as a percent) 51.10% 48.70%
Government    
Disaggregation of Revenue [Line Items]    
Total revenues $ 249.0 $ 226.4
Government | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (as a percent) 42.40% 44.80%
Self-pay    
Disaggregation of Revenue [Line Items]    
Total revenues $ 16.8 $ 13.2
Self-pay | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (as a percent) 2.90% 2.60%
Other    
Disaggregation of Revenue [Line Items]    
Total revenues $ 21.7 $ 20.0
Other | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (as a percent) 3.60% 3.90%
Other service revenues    
Disaggregation of Revenue [Line Items]    
Total revenues $ 8.5 $ 6.7