Comprehensive Income - Schedule of Components of Other Comprehensive (loss) Income and Income Tax Expense Allocated to Each Component (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Equity [Abstract]
Translation adjustments - Before Tax Amount	$ (22.6)	$ (9.0)
Adjustment for net periodic pension and other postretirement benefits plan cost - Before Tax Amount	3.5	1.4
Change in fair value of derivatives - Before Tax Amount	0.1	0.1
Other comprehensive (loss) income - Before Tax Amount	(19.0)	(7.5)
Adjustment for net periodic pension and other postretirement benefits plan cost - Income Tax Expense	1.3	0.5
Change in fair value of derivatives - Income Tax Expense	0.1	0.1
Other comprehensive (loss) income - Income Tax Expense	1.4	0.6
Translation adjustments - Net of Tax Amount	(22.6)	(9.0)
Adjustment for net periodic pension and postretirement benefits plan cost	2.2	0.9
Other comprehensive loss	$ (20.4)	$ (8.1)