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Goodwill and Intangible Assets - Narrative (Details) | 3 Months Ended |  |
--- | --- | --- | ---
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 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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