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Organization and Summary of Accounting Policies - Revenues by Sources (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Total revenues $ 821.5 $ 770.4 $ 2,423.7 $ 2,249.9
Patient service revenues        
Disaggregation of Revenue [Line Items]        
Total revenues $ 798.5 $ 753.2 $ 2,361.1 $ 2,206.6
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% 100.00% 100.00%
Private insurance        
Disaggregation of Revenue [Line Items]        
Total revenues $ 404.1 $ 393.2 $ 1,226.7 $ 1,152.2
Private insurance | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Revenue by service type as a proportion of total revenues (percent) 50.60% 52.20% 52.00% 52.20%
Government        
Disaggregation of Revenue [Line Items]        
Total revenues $ 347.0 $ 318.3 $ 1,011.7 $ 932.0
Government | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Revenue by service type as a proportion of total revenues (percent) 43.50% 42.30% 42.80% 42.20%
Self-pay        
Disaggregation of Revenue [Line Items]        
Total revenues $ 26.5 $ 19.7 $ 68.0 $ 60.2
Self-pay | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Revenue by service type as a proportion of total revenues (percent) 3.30% 2.60% 2.90% 2.70%
Other        
Disaggregation of Revenue [Line Items]        
Total revenues $ 20.9 $ 22.0 $ 54.7 $ 62.2
Other | Customer | Revenue        
Disaggregation of Revenue [Line Items]        
Revenue by service type as a proportion of total revenues (percent) 2.60% 2.90% 2.30% 2.90%
Other service revenues        
Disaggregation of Revenue [Line Items]        
Total revenues $ 23.0 $ 17.2 $ 62.6 $ 43.3