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Segment Information Major Geographic Area (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 2,341.0 | $ 1,902.6 | $ 1,884.9 | $ 1,753.9 | $ 2,264.5 | $ 1,922.2 | $ 1,917.9 | $ 1,742.0 | $ 7,882.4 | $ 7,846.6 | $ 7,613.8
Long-Lived Assets | 1,045.1 |  |  |  | 1,004.4 |  |  |  | 1,045.1 | 1,004.4 |
Domestic |  |  |  |  |  |  |  |  |  |  |
Revenues and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,714.3 | 4,684.8 | 4,475.5
Long-Lived Assets | 705.5 |  |  |  | 684.8 |  |  |  | 705.5 | 684.8 |
Total International |  |  |  |  |  |  |  |  |  |  |
Revenues and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,168.1 | 3,161.8 | 3,138.3
Long-Lived Assets | 339.6 |  |  |  | 319.6 |  |  |  | 339.6 | 319.6 |
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Revenues and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 681.8 | 695.7 | 687.7
Long-Lived Assets | 56.2 |  |  |  | 52.0 |  |  |  | 56.2 | 52.0 |
Continental Europe |  |  |  |  |  |  |  |  |  |  |
Revenues and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 716.1 | 699.8 | 697.2
Long-Lived Assets | 73.6 |  |  |  | 57.0 |  |  |  | 73.6 | 57.0 |
Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Revenues and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 913.6 | 923.0 | 916.9
Long-Lived Assets | 115.5 |  |  |  | 118.3 |  |  |  | 115.5 | 118.3 |
Latin America |  |  |  |  |  |  |  |  |  |  |
Revenues and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 355.9 | 372.7 | 383.5
Long-Lived Assets | 48.2 |  |  |  | 49.0 |  |  |  | 48.2 | 49.0 |
Other |  |  |  |  |  |  |  |  |  |  |
Revenues and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 500.7 | 470.6 | $ 453.0
Long-Lived Assets | $ 46.1 |  |  |  | $ 43.3 |  |  |  | $ 46.1 | $ 43.3 |

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