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Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Equity [Abstract]        
Reclassification adjustment from AOCI, Pension and other postretirement benefit plans, pre-tax $ 4.2 $ 3.5 $ 8.4 $ 7.0
Reclassification adjustment from AOCI, Derivative financial instruments, pre-tax $ (3.4) $ 16.3 $ (3.1) $ 26.6