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Summary of Significant Accounting Policies - Textual (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
state
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]      
Number of states in which entity operates | state 39    
Number of reportable segments | segment 2    
Fair value of the Redeemable noncontrolling interests $ 400.0    
Minimum accrual of loss contingency needed to accrue for related legal fees 5.0    
Advertising expense $ 4.6 $ 6.1 $ 6.7
Market access assets      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible asset useful life 20 years    
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | RAC Audits      
Finite-Lived Intangible Assets [Line Items]      
Percentage of Medicare patient discharges (percent) 1.00%