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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]          
Impairment of goodwill $ 0   $ 0 $ 16,400,000 $ 0
Amortization of acquired intangibles 1,900,000   $ 1,700,000 3,500,000 3,300,000
Impairment of definite and indefinite-lived intangible assets 0        
Customer Relationships          
Finite-Lived Intangible Assets [Line Items]          
Additions       $ 0 0
Customer Relationships | Minimum          
Finite-Lived Intangible Assets [Line Items]          
Acquired infinite-lived intangible asset, useful life       4 years  
Customer Relationships | Maximum          
Finite-Lived Intangible Assets [Line Items]          
Acquired infinite-lived intangible asset, useful life       10 years  
Trade Names          
Finite-Lived Intangible Assets [Line Items]          
Additions       $ 1,000,000.0 1,000,000.0
Liquid Alpha          
Finite-Lived Intangible Assets [Line Items]          
Impairment of goodwill $ 0 $ 16,400,000   $ 16,400,000 $ 0