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Organization and Summary of Accounting Policies - Schedule of Revenues by Sources (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]    
Total revenues $ 666.2 $ 596.2
Patient service revenues    
Disaggregation of Revenue [Line Items]    
Total revenues $ 656.4 $ 587.7
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 $ 335.6 $ 300.2
Private insurance | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (as a percent) 51.10% 51.10%
Government    
Disaggregation of Revenue [Line Items]    
Total revenues $ 287.8 $ 249.0
Government | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (as a percent) 43.80% 42.40%
Self-pay    
Disaggregation of Revenue [Line Items]    
Total revenues $ 15.6 $ 16.8
Self-pay | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (as a percent) 2.40% 2.90%
Other    
Disaggregation of Revenue [Line Items]    
Total revenues $ 17.4 $ 21.7
Other | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (as a percent) 2.70% 3.60%
Other service revenues    
Disaggregation of Revenue [Line Items]    
Total revenues $ 9.8 $ 8.5