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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	12 Months Ended
	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of prior service cost	$ 0.4	[1]
Amortization of actuarial losses	191.4	[1]
Total before tax	191.8
Income tax benefit	(6.9)
Net of tax	$ 184.9
[1] These items are included in net periodic postretirement cost (see note 16).

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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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