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Supplemental Cash Flow Data (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Change in Operating Capital [Abstract] |  |  |
(Increase) decrease in accounts receivable | $ (341.6) | $ (376.5) | $ (1,063.6)
(Increase) decrease in work in process and other current assets | 5.4 | (89.7) | (79.6)
Increase (decrease) in accounts payable | 763.2 | 741.9 | 1,443.7
Increase (decrease) in customer advances, taxes payable and other current liabilities | 4.8 | 31.6 | 243.9
Change in other assets and liabilities, net | (83.3) | (4.5) | 15.1
Change in operating capital | 348.5 | 302.8 | 559.5
Income taxes paid | 566.0 | 570.4 | 540.1
Interest paid | $ 226.2 | $ 216.7 | $ 173.9

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