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Summary of Significant Accounting Policies - Classification of Recoverable Customer Engineering, Development and Tooling Costs related to Long-Term Supply Agreements (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Pre Production Costs Related to Long Term Supply Arrangements [Line Items]    
Recoverable customer E&D and tooling $ 307.4 $ 229.3
Other current assets    
Pre Production Costs Related to Long Term Supply Arrangements [Line Items]    
Recoverable customer E&D and tooling 248.1 185.9
Other long-term assets    
Pre Production Costs Related to Long Term Supply Arrangements [Line Items]    
Recoverable customer E&D and tooling $ 59.3 $ 43.4