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Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Jan. 31, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Expected amount to be reclassified into earnings from accumulated other comprehensive loss			$ 11.1
Tax benefits (expense) related to derivative instruments and hedging activities recognized in other comprehensive income (loss)			(3.3)	$ (15.9)	$ 3.9
Lear FAWSN
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Noncontrolling interests, fair value	$ 14.0
Fair value of previously held equity interest in acquiree	$ 23.0		23.0
Lear STEC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Noncontrolling interests, fair value		$ 125.0
Fair value of previously held equity interest in acquiree		$ 94.0	94.0
Level 3 | Lear FAWSN
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, plant and equipment, fair value			11.0
Intangible assets			7.5
Noncontrolling interests, fair value			14.0
Level 3 | Antolin Seating
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, plant and equipment, fair value			95.4	95.4
Intangible assets			187.4	187.4
Noncontrolling interests, fair value			125.0	125.0
Designated as hedging instrument | Foreign exchange contract | Derivative instruments and hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pretax net losses related to derivative instruments and hedging activities in accumulated other comprehensive loss			$ 1.7	$ 18.2

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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- Definition

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

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-Name Accounting Standards Codification
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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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Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

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Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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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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