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Acquisitions - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 05, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
NYX |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid in acquisition | $ 665.8 |  |  |
Fair value of shares acquired | 91.9 |  |  |
Non-controlling equity interest held before acquisition | $ 90.4 |  |  |
Acquisition-related costs recorded |  |  | $ 7.7 | $ 15.1
Allocated purchase price adjustment |  | $ 8.1 |  |
Royalty rate |  |  | 0.50% |
Spicerack |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill deductible for income tax purposes |  |  | $ 12.8 |
Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Discount rate |  |  | 9.00% |
Royalty rate |  |  | 1.00% |
Minimum | NYX |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Discount rate |  |  | 10.00% |
Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Discount rate |  |  | 20.00% |
Royalty rate |  |  | 16.00% |
Contingent acquisition consideration liabilities |  |  | $ 49.2 |
Maximum | NYX |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Discount rate |  |  | 14.00% |
Business Combination | Revenue |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue and earnings associated with acquisitions (less than) |  |  | 5.00% |
Business Combination | Earnings |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue and earnings associated with acquisitions (less than) |  |  | 5.00% |

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- Definition Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Finite-Lived Intangibles, Discount Rate + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Finite-Lived Intangibles, Royalty Rate + References No definition available. + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=SL65897772-128472 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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