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Summary of Significant Accounting Policies - Classification of Recoverable Customer Engineering, Development and Tooling Costs related to Long-Term Supply Agreements (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Pre Production Costs Related to Long Term Supply Arrangements [Line Items] |  |
Recoverable customer E&D and tooling | $ 333.4 | $ 271.0
Current |  |
Pre Production Costs Related to Long Term Supply Arrangements [Line Items] |  |
Recoverable customer E&D and tooling | 212.0 | 157.2
Long-term |  |
Pre Production Costs Related to Long Term Supply Arrangements [Line Items] |  |
Recoverable customer E&D and tooling | $ 121.4 | $ 113.8

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- Definition The carrying amount as of the balance sheet date of capitalized preproduction costs incurred on long-term supply arrangements, including recoverable costs to design and develop products. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27011391&loc=d3e105117-122735 + Details
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