Income Tax Expense Allocated to Each Component of Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive Income [Line Items]
Translation adjustments - Before Tax Amount	$ (22.8)	$ 11.4	$ (70.1)
Adjustment for net periodic pension and other postretirement benefits plan cost - Before Tax Amount	919.0	(285.1)	(485.9)
Change in fair value of derivatives - Before Tax Amount	0.6	0.8	1.1
Other comprehensive income (loss) - Before Tax Amount	896.8	(272.9)	(554.9)
Translation adjustments - Income Tax Expense (Benefit)
Adjustment for net periodic pension and other postretirement benefits plan cost - Income Tax Expense (Benefit)	355.3	(107.5)	(182.8)
Change in fair value of derivatives - Income Tax Expense (Benefit)	0.2	0.3	0.4
Other comprehensive income (loss) - Income Tax Expense (Benefit)	355.5	(107.2)	(182.4)
Translation adjustments - Net of Tax Amount	(22.8)	11.4	(70.1)
Adjustment for net periodic pension and other postretirement benefits plan cost	563.7	(177.6)	(303.1)
Change in fair value of derivatives - Net of Tax Amount	0.4	0.5	0.7
Other comprehensive income (loss) - Net of Tax Amount	$ 541.3	$ (165.7)	$ (372.5)