Income Tax Expense Allocated to Each Component of Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Other Comprehensive Income [Line Items]
Translation adjustments - Before Tax Amount	$ (25.8)	$ (61.6)	$ (18.7)	$ (19.8)
Adjustment for net periodic pension and other postretirement benefits plan cost - Before Tax Amount	7.6	2.0	15.4	3.6
Change in fair value of derivatives - Before Tax Amount	0.1	0.1	0.2	0.6
Other comprehensive income - Before Tax Amount	(18.1)	(59.5)	(3.1)	(15.6)
Translation adjustments - Income Tax Expense	0	0	0	0
Adjustment for net periodic pension and other postretirement benefits plan cost - Income Tax Expense	2.8	1.2	11.5	2.1
Change in fair value of derivatives - Income Tax Expense	0.1		0.1	0.2
Other comprehensive income - Income Tax Expense	2.9	1.2	11.6	2.3
Translation adjustments - Net of Tax Amount	(25.8)	(61.6)	(18.7)	(19.8)
Adjustment for net periodic pension and other postretirement benefits plan cost - Net of Tax Amount	4.8	0.8	3.9	1.5
Change in fair value of derivatives - Net of Tax Amount		0.1	0.1	0.4
Other comprehensive income - Net of Tax Amount	$ (21.0)	$ (60.7)	$ (14.7)	$ (17.9)