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Schedule of Expected Benefit Payments (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013
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Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2014 | $ 32.2
2015 | 34.1
2016 | 36.0
2017 | 37.5
2018 | 39.0
Years 2019-2023 | 215.0
Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2014 | 3.4
2015 | 3.4
2016 | 3.4
2017 | 2.8
2018 | 2.8
Years 2019-2023 | $ 12.7

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