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Pension and Other Post-Retirement Benefit Plans - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
plan
Jun. 30, 2019
USD ($)
plan
Retirement Benefits [Abstract]    
Defined Contribution Plan, Number of Plans | plan 2 2
Defined Benefit Plan, Plan Assets, Payment for Settlement   $ 7.8
Expected contribution to pension plans and post-retirement benefit plans $ 1.7 1.7
Contributions made to pension plans   $ 1.2
Non-cash settlement charge $ 2.5