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Pension Plans - Expected Benefit Payments (Detail)
$ in Millions
Dec. 31, 2015
USD ($)
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]  
2016 $ 45.2
2017 43.1
2018 43.7
2019 44.3
2020 44.9
2021-2025 $ 233.1