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Employee Benefit Plans - Schedule of Future Payments to Participants from Defined Benefit Plans (Detail) - Defined Benefit Pension Plan [Member]
$ in Millions
Dec. 31, 2017
USD ($)
Future payments of defined benefit plan  
2018 $ 46.8
2019 46.3
2020 45.4
2021 44.4
2022 43.1
Next five years $ 193.5