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Accumulated Other Comprehensive Income - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other income (expense), net $ (8.4) $ (1.2)
Total reclassification for the period 34.9 35.8
Translation Adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total reclassification for the period (5.3)  
Amortization of prior service cost    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Amortization of postretirement plan items, before tax (1.4) (1.4)
Amortization of actuarial losses    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Amortization of postretirement plan items, before tax 43.3 38.6
Postretirement Plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Amortization of postretirement plan items, before tax 36.6 37.2
Income tax benefit (1.7) (1.4)
Total reclassification for the period 40.2  
Adjustment for substantial completion of liquidation of foreign subsidiary | Translation Adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other income (expense), net $ (5.3) $ 0.0