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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018		Jul. 01, 2017	Dec. 31, 2017
Income Tax Contingency [Line Items]
Tax benefit adjustment to the provisional income tax expense	$ 2.4
Retained earnings	$ 4,750.0	[1]		$ 4,171.9
U.S. federal statutory income tax rate	21.00%		35.00%
Accounting Standards Update 2016-16
Income Tax Contingency [Line Items]
Deferred tax asset as a result of ASU adoption				2.3
Retained earnings				$ 2.3
Other Income And Expense | Lear FAWSN
Income Tax Contingency [Line Items]
Consolidation of affiliate, revaluation gain	$ 10.0
[1] Unaudited.

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Tax Cuts and Jobs Act of 2017,Measurement Period Adjustment,Income Tax Expense (Benefit)

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