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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, 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
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 7,792.1 | $ 7,399.8 | $ 6,633.0 | $ 5,190.8 | $ 6,733.6 | $ 7,810.7 | $ 8,496.4 | $ 7,340.7 | $ 27,015.8 | $ 30,381.4 | $ 43,391.8
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 188.9 | 245.7 | 276.7
Non-current assets: |  |  |  |  |  |  |  |  |  |  |
Non-current assets | 1,576.1 |  |  |  | 1,279.3 |  |  |  | 1,576.1 | 1,279.3 |
Total assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | 5,412.6 |  |  |  | 4,525.3 |  |  |  | 5,412.6 | 4,525.3 |
Revenue | 7,792.1 | $ 7,399.8 | $ 6,633.0 | $ 5,190.8 | 6,733.6 | $ 7,810.7 | $ 8,496.4 | $ 7,340.7 | 27,015.8 | 30,381.4 | 43,391.8
United States |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 14,368.8 | 15,496.3 | 21,519.6
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | (26.1) | 19.2 | 51.8
Non-current assets: |  |  |  |  |  |  |  |  |  |  |
Non-current assets | 799.2 |  |  |  | 639.9 |  |  |  | 799.2 | 639.9 |
Total assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | 2,462.0 |  |  |  | 1,890.5 |  |  |  | 2,462.0 | 1,890.5 |
Revenue |  |  |  |  |  |  |  |  | 14,368.8 | 15,496.3 | 21,519.6
EMEA |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 6,018.6 | 6,382.2 | 8,613.1
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 155.3 | 153.8 | 123.7
Non-current assets: |  |  |  |  |  |  |  |  |  |  |
Non-current assets | 587.4 |  |  |  | 604.6 |  |  |  | 587.4 | 604.6 |
Total assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | 1,805.6 |  |  |  | 1,719.5 |  |  |  | 1,805.6 | 1,719.5 |
Revenue |  |  |  |  |  |  |  |  | 6,018.6 | 6,382.2 | 8,613.1
Asia/Pacific |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,271.1 | 5,863.4 | 9,844.7
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 38.3 | 54.4 | 76.2
Non-current assets: |  |  |  |  |  |  |  |  |  |  |
Non-current assets | 17.2 |  |  |  | 5.3 |  |  |  | 17.2 | 5.3 |
Total assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | 661.2 |  |  |  | 614.9 |  |  |  | 661.2 | 614.9 |
Revenue |  |  |  |  |  |  |  |  | 4,271.1 | 5,863.4 | 9,844.7
Americas, excluding United States |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,357.2 | 2,639.5 | 3,414.4
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 21.3 | 18.2 | 24.9
Non-current assets: |  |  |  |  |  |  |  |  |  |  |
Non-current assets | 172.4 |  |  |  | 29.5 |  |  |  | 172.4 | 29.5 |
Total assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | $ 483.9 |  |  |  | $ 300.2 |  |  |  | 483.9 | 300.2 |
Revenue |  |  |  |  |  |  |  |  | 2,357.2 | 2,639.5 | 3,414.4
U.K. |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,100.0 | 4,700.0 | 6,200.0
Total assets: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,100.0 | 4,700.0 | 6,200.0
Singapore |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,200.0 | 5,800.0 | 9,700.0
Total assets: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 4,200.0 | $ 5,800.0 | $ 9,700.0

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