Comprehensive Income - Schedule of Components of Other Comprehensive Income (loss) and Income Tax Expense Allocated to Each Component (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Equity [Abstract]
Translation adjustments - Before Tax Amount	$ 17.9	$ (22.6)
Adjustment for net periodic pension and other postretirement benefits plan cost - Before Tax Amount	5.2	3.5
Change in fair value of derivatives - Before Tax Amount		0.1
Other comprehensive (loss) income - Before Tax Amount	23.1	(19.0)
Translation adjustments - Income Tax Expense	0.0	0.0
Adjustment for net periodic pension and other postretirement benefits plan cost - Income Tax Expense	5.8	1.3
Change in fair value of derivatives - Income Tax Expense		0.1
Other comprehensive (loss) income - Income Tax Expense	5.8	1.4
Translation adjustments - Net of Tax Amount	17.9	(22.6)
Adjustment for net periodic pension and other postretirement benefits plan cost - Net of Tax Amount	(0.6)	2.2
Change in fair value of derivatives - Net of Tax Amount		0.0
Other comprehensive income (loss)	$ 17.3	$ (20.4)