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Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Receivables And Other

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Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Finite-Lived Intangibles, Discount Rate

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Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Finite-Lived Intangibles, Royalty Rate

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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.

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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.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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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.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Amount of assets acquired at the acquisition date.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent.

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The amount of financial assets (as defined) recognized as of the acquisition date.

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The amount of financial liabilities assumed (as defined) which have been recognized as of the acquisition date.

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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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.

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Description of the Business and Summary of Significant Accounting Policies - Aggregate Business Acquisitions Completed (Details) - USD ($) $ in Millions			3 Months Ended		6 Months Ended
	Jan. 23, 2018	Jan. 05, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Preliminary Purchase Price Allocation Summary
Goodwill			$ 3,312.8		$ 3,312.8		$ 2,956.1
Intangible assets acquired, royalty rate					0.50%
Minimum
Preliminary Purchase Price Allocation Summary
Intangible assets acquired, discount rate					10.00%
Maximum
Preliminary Purchase Price Allocation Summary
Intangible assets acquired, discount rate					14.00%
NYX
Business Acquisition [Line Items]
Payments to acquire business		$ 665.8
Fair value of shares acquired		91.9
Fair value of non-controlling equity interest		90.4
Acquisition related costs			7.7
Preliminary Purchase Price Allocation Summary
Cash, cash equivalents and restricted cash		23.3
Accounts receivables and other current assets		55.2
Property and equipment and other non-current assets		22.1
Goodwill		376.4
Intangible assets		350.0
Total assets		827.0
Current liabilities		82.0
Deferred income taxes		66.3
Assumed debt and other liabilities		299.7
Total liabilities		448.0
Total consideration transferred		379.0
Receivables acquired		43.0
Contract assets acquired		12.9
Assumed contract liabilities		15.7
Unaudited Pro Forma Financial Information
Revenue since acquisition			50.6		$ 99.8
Earnings since acquisition			8.1		15.5
Revenue			844.7	$ 810.6	1,656.5	$ 1,579.3
Net loss			$ 5.8	$ 52.8	$ 199.9	$ 168.7
Tech Art
Unaudited Pro Forma Financial Information
Total Consideration	$ 9.6
Tech Art \| Intellectual property
Details of Total Intangible Assets
Weighted Average Useful Life (Years)	15 years
Level 3 \| NYX \| Customer relationships
Details of Total Intangible Assets
Fair Value		214.0
Level 3 \| NYX \| Intellectual property
Details of Total Intangible Assets
Fair Value		$ 126.5
Weighted Average Useful Life (Years)		7 years
Level 3 \| NYX \| Brand names
Details of Total Intangible Assets
Fair Value		$ 9.5
Weighted Average Useful Life (Years)		7 years
Level 3 \| NYX \| Minimum \| Customer relationships
Details of Total Intangible Assets
Weighted Average Useful Life (Years)		7 years
Level 3 \| NYX \| Maximum \| Customer relationships
Details of Total Intangible Assets
Weighted Average Useful Life (Years)		10 years