Reclassifications out of Accumulated Other Comprehensive Loss Amortization of Pension and Other postretirement Benefit Plan Cost (Detail) (Pension and Other Postretirement Benefit Plan Cost, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Pension and Other Postretirement Benefit Plan Cost
Amortization of pension and other postretirement benefits plan cost:
Net actuarial loss	$ 50.5	[1]	$ 32.0	[1]	$ 50.2	[1]
Net prior service credit	(19.7)	[1]	(19.1)	[1]	(16.9)	[1]
Curtailments and settlements	0.7	[1]	(2.6)	[1]	(38.7)	[1]
Reclassifications before tax	31.5		10.3		(5.4)
Income tax expense	11.7		3.9		(2.3)
Reclassifications, net of tax	$ 19.8		$ 6.4		$ (3.1)

[1] (a)These accumulated other comprehensive income (loss) components are included in the calculation of net periodic pension and other postretirement benefits plan (income) expense recognized in cost of sales and selling, general and administrative expenses in the Consolidated Statements of Operations (see Note 11).