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Summary of Significant Accounting Policies - Summary of Other (Income) Expense, Net (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |
Other expense | $ 43.8 | $ 57.2 | $ 76.4
Other income | (12.2) | (61.3) | (35.8)
Other (income) expense, net | 31.6 | $ (4.1) | 40.6
U.S. | Pension |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Settlement charge | $ 5.4 |  | $ 34.2

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