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Financial Instruments - Narrative (Details) - USD ($)	1 Months Ended	9 Months Ended
	Jan. 31, 2018	Sep. 29, 2018	Dec. 31, 2017
Derivative [Line Items]
Net gains expected to be reclassified into earnings from accumulated other comprehensive loss		$ 30,200,000
Derivative contracts classified within Level 3 of fair value hierarchy		0	$ 0
Derivative contracts transfers in to Level 3 fair value hierarchy		0
Lear FAWSN
Derivative [Line Items]
Previously held equity interest, fair value	$ 23,000,000
Level 3 | Lear FAWSN
Derivative [Line Items]
Property, plant and equipment, fair value		11,000,000
Intangible assets, fair value		7,500,000
Noncontrolling interest, fair value		14,000,000
Foreign currency contracts | Derivative instruments and hedging | Designated as hedging instrument
Derivative [Line Items]
Pretax gains (losses) related to derivative instruments and hedging activities in accumulated other comprehensive loss		$ 41,200,000	$ (18,200,000)

X

- Definition

Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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No definition available.

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- Definition

This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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