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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 |
--- | --- | --- | --- | ---
Jan. 23, 2018 | Jan. 05, 2018 | Mar. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Preliminary Purchase Price Allocation Summary |  |  |  |  |  |
Goodwill |  |  | $ 3,372.5 | $ 3,372.5 |  | $ 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 |  |  |  |
Details of Total Intangible Assets |  |  |  |  |  |
Revenue since acquisition |  |  |  | 49.2 |  |
Earnings since acquisition |  |  |  | $ 7.4 |  |
Unaudited Pro Forma Financial Information |  |  |  |  |  |
Revenue |  |  | 811.8 |  | $ 768.7 |
Net loss |  |  | $ 194.1 |  | $ 115.9 |
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) |  | 7 years |  |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + 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://www.xbrl.org/2003/role/presentationRef -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 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of financial assets (as defined) recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -URI http://asc.fasb.org/topic&trid=2134543 + Details
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- Definition The amount of financial liabilities assumed (as defined) which have been recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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