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Restructuring - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Restructuring charges, including curtailment and settlement losses $ (72.6)   $ (88.8)
Restructuring charges 70.9 $ 63.6 81.1
Restructuring, expected cost 21.0    
Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges, including curtailment and settlement losses (59.2)   (68.4)
Restructuring charges   55.4  
Selling, general and administrative expenses      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges, including curtailment and settlement losses (14.3)   (18.4)
Restructuring charges   8.5  
Other income and expense, net      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges, including curtailment and settlement losses (0.9)   (2.0)
Restructuring charges   0.3  
Employee termination benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 62.9 54.1 70.0
Asset impairments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 1.3 4.7 3.9
Assets, amount of carrying amount in excess of fair value 1.3 4.7 3.9
Contract termination costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 1.7 0.1 1.7
Other related costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 5.0 4.7 5.5
Pension benefit plan curtailment charges      
Restructuring Cost and Reserve [Line Items]      
Curtailment gain (loss)     (7.7)
Pension      
Restructuring Cost and Reserve [Line Items]      
Pension settlement and curtailment loss 1.7    
Pension | Foreign      
Restructuring Cost and Reserve [Line Items]      
Curtailment gain (loss) $ (0.9) $ 0.0 $ (7.7)