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Business Segments, Geographic Information, and Major Customers - Geographic Summary (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 9,988.6 | $ 10,429.5 | $ 10,150.8 | $ 9,181.3 | $ 8,872.0 | $ 8,543.0 | $ 8,086.2 | $ 8,194.3 | $ 39,750.3 | $ 33,695.5 | $ 27,015.8
Property and equipment, net | 350.3 |  |  |  | 329.8 |  |  |  | 350.3 | 329.8 |
United States |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 20,555.5 | 17,938.0 | 14,368.8
Property and equipment, net | 175.1 |  |  |  | 152.6 |  |  |  | 175.1 | 152.6 |
EMEA |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 9,721.9 | 7,553.3 | 6,018.6
Property and equipment, net | 124.5 |  |  |  | 120.2 |  |  |  | 124.5 | 120.2 |
Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,537.2 | 4,923.0 | 4,271.1
Property and equipment, net | 7.5 |  |  |  | 10.4 |  |  |  | 7.5 | 10.4 |
Americas, excluding United States |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,935.6 | 3,281.2 | 2,357.2
Property and equipment, net | $ 43.1 |  |  |  | $ 46.7 |  |  |  | 43.1 | 46.7 |
U.K. |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 6,300.0 | 5,000.0 | 4,100.0
Singapore |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 5,400.0 | $ 4,800.0 | $ 4,200.0

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