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Pre-Production Costs Related to Long-Term Supply Agreements (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Dec. 31, 2017
Pre Production Costs Related to Long Term Supply Arrangements [Line Items]
Pre-production E&D costs for which reimbursement is contractually guaranteed by the customer	$ 33.5	$ 62.9
Pre-production tooling costs related to customer-owned tools for which reimbursement is contractually guaranteed by the customer	31.8	33.6
Cash collected related to E&D and tooling costs	79.0	$ 87.6
Recoverable customer E&D and tooling	291.9		$ 307.4
Current
Pre Production Costs Related to Long Term Supply Arrangements [Line Items]
Recoverable customer E&D and tooling	225.1		248.1
Long-term
Pre Production Costs Related to Long Term Supply Arrangements [Line Items]
Recoverable customer E&D and tooling	$ 66.8		$ 59.3

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Pre Production Costs Related to Long Term Supply Arrangements [Line Items]

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Amount of recoverable preproduction engineering and design costs related to long term supply agreements capitalized during the reporting period.

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Amount of recoverable preproduction tooling costs related to long term supply agreements capitalized during the reporting period.

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Cash recoveries of preproduction engineering, design and tooling costs incurred on behalf of a customer.

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 10
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6387057&loc=d3e6169-108318

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 10
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6387057&loc=d3e6233-108318

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 10
-Section S99
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=27011391&loc=d3e105117-122735

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