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Goodwill and Intangible Assets - Narrative (Details)	3 Months Ended
Goodwill and Intangible Assets - Narrative (Details)	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)	Mar. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Number of operating segments \| segment	2
Number of non-operating segments \| segment	1
Intangible assets	$ 552,547,000			$ 83,989,000
Amortization expense relating to finite-lived intangible assets	10,922,000	$ 6,851,000
Goodwill [Line Items]
Goodwill	1,193,697,000			$ 836,583,000
Goodwill impairment	$ 0	$ 0
ITG
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets			$ 479,600,000
Goodwill [Line Items]
Goodwill			357,334,000
Intangibles			$ 479,600,000