Acquisitions - Details of Intangible Assets that have been Identified (Details) - Level 3 - NYX $ in Millions	Jan. 05, 2018 USD ($)
Customer relationships
Business Acquisition [Line Items]
Fair Value	$ 214.0
Weighted Average Useful Life	7 years
Intellectual property
Business Acquisition [Line Items]
Fair Value	$ 126.5
Weighted Average Useful Life	7 years
Trade names
Business Acquisition [Line Items]
Fair Value	$ 9.5
Weighted Average Useful Life	7 years

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258

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