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Organization and Summary of Accounting Policies - Schedule of Revenues by Sources (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 559.2	$ 496.1	$ 1,614.9	$ 1,311.8
Total patient service revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 551.4	$ 489.8	$ 1,593.0	$ 1,293.5
Total patient service revenues | Customer | Revenue
Disaggregation of Revenue [Line Items]
Service revenues as a percentage of total revenues	100.00%	100.00%	100.00%	100.00%
Private insurance
Disaggregation of Revenue [Line Items]
Total revenues	$ 271.4	$ 257.4	$ 790.5	$ 682.6
Private insurance | Customer | Revenue
Disaggregation of Revenue [Line Items]
Service revenues as a percentage of total revenues	49.20%	52.60%	49.60%	52.80%
Government
Disaggregation of Revenue [Line Items]
Total revenues	$ 248.0	$ 188.8	$ 700.6	$ 505.4
Government | Customer | Revenue
Disaggregation of Revenue [Line Items]
Service revenues as a percentage of total revenues	45.00%	38.50%	44.00%	39.10%
Self-pay
Disaggregation of Revenue [Line Items]
Total revenues	$ 15.9	$ 19.4	$ 46.9	$ 43.4
Self-pay | Customer | Revenue
Disaggregation of Revenue [Line Items]
Service revenues as a percentage of total revenues	2.90%	4.00%	2.90%	3.40%
Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 16.1	$ 24.2	$ 55.0	$ 62.1
Other | Customer | Revenue
Disaggregation of Revenue [Line Items]
Service revenues as a percentage of total revenues	2.90%	4.90%	3.50%	4.70%
Other service revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 7.8	$ 6.3	$ 21.9	$ 18.3

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