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Organization and Summary of Accounting Policies - Revenues by Sources (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Total revenues $ 776.0 $ 717.4
Patient service revenues    
Disaggregation of Revenue [Line Items]    
Total revenues $ 758.4 $ 705.3
Patient service revenues | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (percent) 100.00% 100.00%
Private insurance    
Disaggregation of Revenue [Line Items]    
Total revenues $ 406.4 $ 361.0
Private insurance | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (percent) 53.60% 51.20%
Government    
Disaggregation of Revenue [Line Items]    
Total revenues $ 316.2 $ 303.6
Government | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (percent) 41.70% 43.00%
Self-pay    
Disaggregation of Revenue [Line Items]    
Total revenues $ 19.8 $ 19.8
Self-pay | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (percent) 2.60% 2.80%
Other    
Disaggregation of Revenue [Line Items]    
Total revenues $ 16.0 $ 20.9
Other | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (percent) 2.10% 3.00%
Other service revenues    
Disaggregation of Revenue [Line Items]    
Total revenues $ 17.6 $ 12.1