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Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Equity [Abstract]    
Reclassification adjustment from AOCL, Pension and other postretirement benefit plans, pre-tax $ 2.1 $ 3.6
Reclassification adjustment from AOCL, Derivative financial instruments, pre-tax (income) expense $ 4.2 $ 13.1