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Comprehensive Income and Equity - Summary of Comprehensive Income and Reconciliations of Equity (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 29, 2018		Sep. 30, 2017	Sep. 29, 2018		Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		$ 4,427.4		$ 3,756.2	$ 4,292.6		$ 3,192.9
Stock-based compensation transactions		12.4		14.9	(6.3)		8.4
Repurchase of common stock		(195.0)		(77.9)	(490.7)		(332.2)
Dividends declared to Lear Corporation stockholders		(46.4)		(34.8)	(141.1)		(105.8)
Dividends declared to noncontrolling interest holders		(0.1)		(0.7)	(59.7)		(33.2)
Adoption of ASU								$ 2.3	$ 54.5
Affiliate transaction (Note 5, Long-Term Assets)					14.0
Redeemable non-controlling interest adjustment		(2.3)		(22.7)	(16.9)		(22.7)
Acquisition of outstanding non-controlling interest					(3.4)
Comprehensive income:
Net income		272.2		315.0	994.1		960.5
Other comprehensive income (loss), net of tax:
Defined benefit plan adjustments		0.2		(1.8)	5.8		(3.0)
Derivative instruments and hedging activities		42.4		(10.8)	46.6		57.2
Foreign currency translation adjustments		(75.1)		89.9	(201.6)		250.7
Other comprehensive income (loss)		(32.5)		77.3	(149.2)		304.9
Comprehensive income		239.7		392.3	844.9		1,265.4
Balance at end of period		4,435.7	[1]	4,027.3	4,435.7	[1]	4,027.3
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning redeemable noncontrolling interest balance					153.4
Redeemable non-controlling interest adjustment		(2.3)		(22.7)	(16.9)		(22.7)
Comprehensive income (loss):
Ending redeemable noncontrolling interest balance	[1]	161.6			161.6
Lear Corporation Stockholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		4,299.9		3,621.9	4,150.5		3,057.2
Stock-based compensation transactions		12.4		14.9	(6.3)		8.4
Repurchase of common stock		(195.0)		(77.9)	(490.7)		(332.2)
Dividends declared to Lear Corporation stockholders		(46.4)		(34.8)	(141.1)		(105.8)
Adoption of ASU								$ 2.3	$ 54.5
Redeemable non-controlling interest adjustment		(2.3)		(22.7)	(16.9)		(22.7)
Comprehensive income:
Net income		252.5		295.2	937.6		912.9
Other comprehensive income (loss), net of tax:
Defined benefit plan adjustments		0.2		(1.8)	5.8		(3.0)
Derivative instruments and hedging activities		42.4		(10.8)	46.6		57.2
Foreign currency translation adjustments		(70.8)		87.1	(194.9)		244.6
Other comprehensive income (loss)		(28.2)		74.5	(142.5)		298.8
Comprehensive income		224.3		369.7	795.1		1,211.7
Balance at end of period		4,292.9		3,871.1	4,292.9		3,871.1
Increase (Decrease) in Temporary Equity [Roll Forward]
Redeemable non-controlling interest adjustment		(2.3)		(22.7)	(16.9)		(22.7)
Non- controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		127.5		134.3	142.1		135.7
Dividends declared to noncontrolling interest holders		(0.1)		(0.7)	(59.7)		(33.2)
Affiliate transaction (Note 5, Long-Term Assets)					14.0
Acquisition of outstanding non-controlling interest					(3.4)
Comprehensive income:
Net income		19.7		19.8	56.5		47.6
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments		(4.3)		2.8	(6.7)		6.1
Other comprehensive income (loss)		(4.3)		2.8	(6.7)		6.1
Comprehensive income		15.4		22.6	49.8		53.7
Balance at end of period		142.8		$ 156.2	142.8		$ 156.2
Redeemable Non-controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redeemable non-controlling interest adjustment		2.3			16.9
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning redeemable noncontrolling interest balance		167.5			153.4
Dividends declared to noncontrolling interest holders		(4.6)			(9.3)
Redeemable non-controlling interest adjustment		2.3			16.9
Comprehensive income (loss):
Net income		2.5			9.8
Foreign currency translation adjustments		(6.1)			(9.2)
Comprehensive income (loss)		(3.6)			0.6
Ending redeemable noncontrolling interest balance		$ 161.6			$ 161.6
[1] Unaudited.

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