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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, 2015
Dec. 31, 2014
Pre Production Costs Related to Long Term Supply Arrangements [Line Items]    
Recoverable customer E&D and tooling $ 215.7 $ 168.7
Other current assets    
Pre Production Costs Related to Long Term Supply Arrangements [Line Items]    
Recoverable customer E&D and tooling 162.0 121.1
Other long-term assets    
Pre Production Costs Related to Long Term Supply Arrangements [Line Items]    
Recoverable customer E&D and tooling $ 53.7 $ 47.6