Organization and Summary of Accounting Policies - Schedule of Revenues by Sources (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Total revenues	$ 848.9	$ 826.2	$ 1,659.8	$ 1,602.2
Patient service revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 826.1	$ 804.2	$ 1,618.2	$ 1,562.6
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	$ 401.4	$ 419.3	$ 800.3	$ 813.2
Private insurance \| Customer \| Revenue
Disaggregation of Revenue [Line Items]
Revenue by service type as a proportion of total revenues (percent)	48.60%	52.10%	49.50%	52.00%
Government
Disaggregation of Revenue [Line Items]
Total revenues	$ 380.6	$ 345.1	$ 738.1	$ 673.6
Government \| Customer \| Revenue
Disaggregation of Revenue [Line Items]
Revenue by service type as a proportion of total revenues (percent)	46.10%	42.90%	45.60%	43.10%
Self-pay
Disaggregation of Revenue [Line Items]
Total revenues	$ 23.5	$ 21.9	$ 42.7	$ 42.0
Self-pay \| Customer \| Revenue
Disaggregation of Revenue [Line Items]
Revenue by service type as a proportion of total revenues (percent)	2.80%	2.70%	2.60%	2.70%
Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 20.6	$ 17.9	$ 37.1	$ 33.8
Other \| Customer \| Revenue
Disaggregation of Revenue [Line Items]
Revenue by service type as a proportion of total revenues (percent)	2.50%	2.30%	2.30%	2.20%
Other service revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 22.8	$ 22.0	$ 41.6	$ 39.6