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Non-controlling Interests (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 16, 2020
Sep. 01, 2020
May 28, 2019
Dec. 31, 2020
May 31, 2015
Passport | Variable Interest Entity, Not Primary Beneficiary          
Noncontrolling Interest [Line Items]          
Consolidation of equity method investment   $ 25.7      
Interest in investment 30.00% 30.00% 30.00%    
Requirement to acquire ownership, consideration, amount   $ 20.0      
Gain on consolidation       $ 5.7  
Evolent Health LLC          
Noncontrolling Interest [Line Items]          
Parent's ownership percentage         70.30%