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Defined Benefit Plans - Schedule of Expected Benefit Payments (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 37.4
2019 39.1
2020 40.4
2021 41.6
2022 43.1
Years 2023-2027 229.9
Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 0.1
2019 0.1
2020 0.1
2021 0.1
2022 0.1
Years 2023-2027 $ 0.3