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Income Taxes - Summary of Differences Between Provision (Benefit) for Income Taxes Calculated at United States Federal Statutory Income Tax Rate and Consolidated Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Consolidated income before provision for income taxes and equity in net income of affiliates multiplied by the United States federal statutory income tax rate |  |  |  |  | $ 323.1 | $ 534.4 | $ 468.4
Differences in income taxes on foreign earnings, losses and remittances |  |  |  |  | 56.6 | (128.9) | (43.9)
Valuation allowance adjustments | $ 11.1 |  |  |  | (52.4) | (56.8) | (44.2)
Research and development and other tax credits |  |  |  |  | (9.9) | (26.8) | (2.7)
Repatriation of certain foreign earnings |  |  | $ 22.0 |  | 0.0 | (289.7) | 0.0
Transition tax on accumulated foreign earnings |  |  |  | $ 131.0 | (15.1) | 131.0 | 0.0
U.S. tax rate change and other tax reform items |  |  |  |  | 9.8 | 42.5 | 0.0
Foreign-derived intangible income (FDII) deduction |  |  |  |  | (27.6) | 0.0 | 0.0
U.S. expenses apportioned to GILTI and foreign branches |  |  |  |  | 17.6 | 0.0 | 0.0
Tax audits and assessments | $ (15.8) | $ (17.4) |  |  | 6.9 | (1.4) | (1.8)
Other |  |  |  |  | 2.9 | (6.8) | (5.6)
Provision for income taxes |  |  |  |  | $ 311.9 | $ 197.5 | $ 370.2

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