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Amounts Related to Postretirement Plans Not Reclassified in Entirely out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Amortization of prior service cost        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amortization of postretirement plan items [1] $ (1.4) $ (0.7) $ (2.8) $ (1.5)
Amortization of actuarial losses        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amortization of postretirement plan items [1] 39.4 47.0 78.0 95.3
Accumulated Defined Benefit Plans Adjustment Attributable to Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amortization of postretirement plan items 38.0 46.3 75.2 93.8
Income tax benefit (1.5) (0.7) (2.9) (3.0)
Net of tax $ 36.5 $ 45.6 $ 72.3 $ 90.8
[1] These items are included in net periodic postretirement cost (see note (c)).