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Segment and Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Schedule of Revenue and Fixed Assets, net of the Company by Geographic Location | The following table presents Revenue and Fixed assets (net) of the Company by geographic location. Revenue by geographic location is primarily based on the location of an Affiliate.
| For the Years Ended December 31,
| 2015 |  | 2016 |  | 2017
Revenue |  |  |  |  |
United States | $ | 1,657.2 |  |  | $ | 1,477.5 |  |  | $ | 1,571.4 |
United Kingdom | 645.3 |  |  | 566.4 |  |  | 587.3 |
Other | 182.0 |  |  | 150.7 |  |  | 146.3 |
Total | $ | 2,484.5 |  |  | $ | 2,194.6 |  |  | $ | 2,305.0 |
| December 31,
| 2015 |  | 2016 |  | 2017
Fixed Assets, Net |  |  |  |  |
United States | $ | 98.6 |  |  | $ | 97.3 |  |  | $ | 97.8 |
United Kingdom | 12.3 |  |  | 9.9 |  |  | 11.4 |
Other | 3.2 |  |  | 2.9 |  |  | 1.8 |
Total | $ | 114.1 |  |  | $ | 110.1 |  |  | $ | 111.0 |

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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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