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Postretirement Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 10.8
2019 10.4
2020 10.2
2021 10.0
2022 9.5
2023 - 2027 41.7
U.S. Plan [Member] | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 24.9
2019 24.2
2020 23.1
2021 22.8
2022 22.3
2023 - 2027 103.2
International Plan [Member] | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 3.9
2019 3.6
2020 4.4
2021 3.9
2022 4.2
2023 - 2027 $ 19.5