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Segment and Geographic Information Segment and Geographic Information - Revenues and Assets by Geographic Location (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 550.3 | $ 544.7 | $ 554.1 | $ 545.4 | $ 589.8 | $ 613.1 | $ 646.6 | $ 635.0 | $ 2,194.6 | $ 2,484.5 | $ 2,510.9
Fixed Assets, net | 110.1 |  |  |  | 114.1 |  |  |  | 110.1 | 114.1 | 95.4
United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,477.5 | 1,657.2 | 1,731.5
Fixed Assets, net | 97.3 |  |  |  | 98.6 |  |  |  | 97.3 | 98.6 | 80.2
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 566.4 | 645.3 | 567.1
Fixed Assets, net | 9.9 |  |  |  | 12.3 |  |  |  | 9.9 | 12.3 | 11.9
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 150.7 | 182.0 | 212.3
Fixed Assets, net | $ 2.9 |  |  |  | $ 3.2 |  |  |  | $ 2.9 | $ 3.2 | $ 3.3

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- Definition Amount of fixed fee revenue for the management of an investment fund portfolio. Excludes investment advisory, distribution and servicing, and performance fees. + References No definition available. + Details
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