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Summary of Significant Accounting Policies - Summary of Other (Income) Expense, Net (Detail) - USD ($) $ in Millions	12 Months Ended
	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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Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements, Lump-Sum Payout Offer

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