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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, 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
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 8,872.0 | $ 8,543.0 | $ 8,086.2 | $ 8,194.3 | $ 7,792.1 | $ 7,399.8 | $ 6,633.0 | $ 5,190.8 | $ 33,695.5 | $ 27,015.8 | $ 30,381.4
Property and equipment, net | 329.8 |  |  |  | 311.2 |  |  |  | 329.8 | 311.2 |
United States |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 17,938.0 | 14,368.8 | 15,496.3
Property and equipment, net | 152.6 |  |  |  | 137.7 |  |  |  | 152.6 | 137.7 |
EMEA |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 7,553.3 | 6,018.6 | 6,382.2
Property and equipment, net | 120.2 |  |  |  | 122.9 |  |  |  | 120.2 | 122.9 |
Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,923.0 | 4,271.1 | 5,863.4
Property and equipment, net | 10.4 |  |  |  | 1.4 |  |  |  | 10.4 | 1.4 |
Americas, excluding United States |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,281.2 | 2,357.2 | 2,639.5
Property and equipment, net | $ 46.7 |  |  |  | $ 49.1 |  |  |  | 46.7 | 49.1 |
U.K. |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,000.0 | 4,100.0 | 4,700.0
Singapore |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 4,800.0 | $ 4,200.0 | $ 5,800.0

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