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Goodwill and Intangible Assets - Narrative (Details)		12 Months Ended
Goodwill and Intangible Assets - Narrative (Details)	Jul. 01, 2019 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 01, 2019 USD ($)
Goodwill [Line Items]
Number of operating segments \| segment		2
Number of non-operating segments \| segment		1
Goodwill		$ 1,148,926,000	$ 836,583,000
Goodwill impairment	$ 0	0	0	$ 0
Intangible assets		529,638,000	83,989,000
Amortization expense relating to finite-lived intangible assets		70,595,000	$ 26,123,000	$ 15,447,000
ITG
Goodwill [Line Items]
Goodwill		312,343,000			$ 357,334,000
Intangible assets acquired		$ 517,200,000			$ 479,600,000