Organization and Summary of Accounting Policies - Schedule of Revenues by Sources (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Total revenues	$ 810.9	$ 776.0
Patient service revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 792.1	$ 758.4
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	$ 398.9	$ 393.8
Private insurance \| Customer \| Revenue
Disaggregation of Revenue [Line Items]
Revenue by service type as a proportion of total revenues (percent)	50.40%	51.90%
Government
Disaggregation of Revenue [Line Items]
Total revenues	$ 357.4	$ 328.5
Government \| Customer \| Revenue
Disaggregation of Revenue [Line Items]
Revenue by service type as a proportion of total revenues (percent)	45.10%	43.30%
Self-pay
Disaggregation of Revenue [Line Items]
Total revenues	$ 19.2	$ 20.1
Self-pay \| Customer \| Revenue
Disaggregation of Revenue [Line Items]
Revenue by service type as a proportion of total revenues (percent)	2.40%	2.70%
Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 16.6	$ 16.0
Other \| Customer \| Revenue
Disaggregation of Revenue [Line Items]
Revenue by service type as a proportion of total revenues (percent)	2.10%	2.10%
Other service revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 18.8	$ 17.6