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Amounts Related to Postretirement Plans Not Reclassified in Entirely out of Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of prior service cost			$ 0.2	[1]
Amortization of actuarial losses	38.0	[1]	48.3	[1]
Total before tax	38.0		48.5
Income tax benefit	(1.4)		(1.8)
Net of tax	$ 36.6		$ 46.7
[1] These items are included in net periodic postretirement cost (see note (b)).

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Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

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