Other Comprehensive (Loss) Income - Schedule of Components of Other Comprehensive (Loss) Income and Income Tax (Benefit) Expense Allocated to Each Component (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive (loss) income, Before Tax Amount	$ (34.7)	$ 0.9
Other comprehensive (loss) income, Income Tax	(3.5)	(0.7)
Other comprehensive (loss) income	(31.2)	1.6
Translation adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive (loss) income, Before Tax Amount	(20.0)	1.2
Other comprehensive (loss) income	(20.0)	1.2
Adjustments for net periodic pension and OPEB cost
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive (loss) income, Before Tax Amount	1.0	(0.3)
Other comprehensive (loss) income, Income Tax	0.2	(0.1)
Other comprehensive (loss) income	0.8	(0.2)
Changes in Fair Value of Derivatives
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive (loss) income, Before Tax Amount	(15.7)
Other comprehensive (loss) income, Income Tax	(3.7)
Other comprehensive (loss) income	$ (12.0)
Other
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive (loss) income, Income Tax		(0.6)
Other comprehensive (loss) income		$ 0.6