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Postretirement Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 10.3
2020 9.8
2021 9.6
2022 9.3
2023 8.9
2024 - 2028 38.5
U.S. Plan [Member] | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 23.2
2020 22.9
2021 22.6
2022 22.2
2023 21.5
2024 - 2028 99.8
International Plan [Member] | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 3.4
2020 3.8
2021 3.8
2022 3.6
2023 3.8
2024 - 2028 $ 19.5