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Summary of Significant Accounting Policies - Additional information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
reportable_operating_segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Significant Accounting Policies [Line Items]      
Allowance for doubtful accounts $ 41.8 $ 32.8  
Inventory reserves 109.2 94.4  
Capitalized pre-production E&D costs 257.4 179.3  
Capitalized pre-production tooling costs related to customer-owned tools 115.4 96.0  
Cash collected related to E&D and tooling costs 311.1 264.6  
Depreciation expense 380.1 325.2 $ 295.3
Capital expenditures recorded in accounts payable 119.7 117.8 91.6
Intangible assets fully amortized 17.0    
Restructuring charges 70.9 63.6 81.1
Fixed asset impairment charges 2.1 0.7 1.8
Engineering and development costs 147.9 143.7 126.8
Foreign currency transaction gain (loss) $ (5.1) (7.6) (28.5)
Number of reportable operating segments | reportable_operating_segment 2    
Asset impairments      
Significant Accounting Policies [Line Items]      
Restructuring charges $ 1.3 $ 4.7 $ 3.9