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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, 2018 | Dec. 31, 2017
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Pre Production Costs Related to Long Term Supply Arrangements [Line Items] |  |
Recoverable customer E&D and tooling | $ 241.3 | $ 307.4
Current |  |
Pre Production Costs Related to Long Term Supply Arrangements [Line Items] |  |
Recoverable customer E&D and tooling | 160.9 | 248.1
Long-term |  |
Pre Production Costs Related to Long Term Supply Arrangements [Line Items] |  |
Recoverable customer E&D and tooling | $ 80.4 | $ 59.3

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