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Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 29, 2018		Sep. 30, 2017	Dec. 31, 2017
Income Tax Contingency [Line Items]
Tax benefit adjustment to the provisional income tax expense		$ 9.3
Retained earnings		$ 4,953.8	[1]		$ 4,171.9
Consolidation of affiliate, revaluation gain	$ 54.2			$ 54.2
U.S. federal statutory income tax rate		21.00%		35.00%
Other Income And Expense | Lear FAWSN
Income Tax Contingency [Line Items]
Consolidation of affiliate, revaluation gain		$ 10.0		$ 54.2
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
[1] Unaudited.

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Tax Cuts And Jobs Act Of 2017, Measurement Period Adjustment, Income Tax Expense (Benefit)

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