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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |
Other expense | $ 52.2 | $ 43.8 | $ 57.2
Other income | (27.6) | (12.2) | (61.3)
Other (income) expense, net | $ 24.6 | $ 31.6 | $ (4.1)

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