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Pension and Post-employment Benefits - Expected Benefit Payments (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2018 $ 37.9
2019 38.7
2020 38.4
2021 37.9
2022 37.5
2023-2027 $ 181.7