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Summary of Components of Net Periodic Benefit Cost and Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension and Other Postretirement Benefits Disclosure [Line Items]      
Tax expense (benefit) related to benefit plans included in other comprehensive income $ 32.5 $ (2.3) $ (21.6)