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Expected Benefit Payments (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Schedule of Other Postretirement Benefits Expected Benefit Payments[Line Items]  
2014 $ 31.8
2015 31.7
2016 32.8
2017 34.8
2018 36.6
2019 through 2023 $ 201.6