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Comprehensive Income and Equity - Summary of Comprehensive Income and Reconciliations of Equity (Detail) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2018		Jul. 01, 2017	Jun. 30, 2018		Jul. 01, 2017	Mar. 31, 2018	Dec. 31, 2017	Apr. 01, 2017	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		$ 4,554.6		$ 3,463.5	$ 4,292.6		$ 3,192.9
Stock-based compensation transactions		12.5		19.3	(18.7)		(6.5)
Repurchase of common stock		(140.3)		(126.8)	(295.7)		(254.3)
Dividends declared to Lear Corporation stockholders		(47.0)		(35.3)	(94.7)		(71.0)
Dividends declared to noncontrolling interest holders		(39.9)		(15.5)	(59.6)		(32.5)
Adoption of ASU								$ 0.0	$ 2.3	$ 0.0	$ 54.5
Affiliate transaction		0.0			14.0
Redeemable non-controlling interest adjustment		(9.2)			(14.6)
Acquisition of outstanding non-controlling interest		0.0			(3.4)
Comprehensive income
Net income		351.2		327.0	721.9		645.5
Other comprehensive income (loss), net of tax
Defined benefit plan adjustments		3.3		(1.9)	5.6		(1.2)
Derivative instruments and hedging activities		(33.2)			4.2
Derivative instruments and hedging activities				15.9			68.0
Foreign currency translation adjustments		(224.6)		110.0	(126.5)		160.8
Other comprehensive income (loss)		(254.5)		124.0	(116.7)		227.6
Comprehensive income		96.7		451.0	605.2		873.1
Balance at end of period		4,427.4	[1]	3,756.2	4,427.4	[1]	3,756.2
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at beginning of period					153.4
Redeemable non-controlling interest adjustment		(9.2)			(14.6)
Comprehensive income (loss):
Balance at end of period	[1]	167.5			167.5
Lear Corporation Stockholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		4,399.4		3,331.0	4,150.5		3,057.2
Stock-based compensation transactions		12.5		19.3	(18.7)		(6.5)
Repurchase of common stock		(140.3)		(126.8)	(295.7)		(254.3)
Dividends declared to Lear Corporation stockholders		(47.0)		(35.3)	(94.7)		(71.0)
Dividends declared to noncontrolling interest holders		0.0		0.0	0.0		0.0
Adoption of ASU								0.0	2.3	0.0	54.5
Affiliate transaction		0.0			0.0
Redeemable non-controlling interest adjustment		(9.2)			(14.6)
Acquisition of outstanding non-controlling interest		0.0			0.0
Comprehensive income
Net income		331.4		311.9	685.1		617.7
Other comprehensive income (loss), net of tax
Defined benefit plan adjustments		3.3		(1.9)	5.6		(1.2)
Derivative instruments and hedging activities		(33.2)			4.2
Derivative instruments and hedging activities				15.9			68.0
Foreign currency translation adjustments		(217.0)		107.8	(124.1)		157.5
Other comprehensive income (loss)		(246.9)		121.8	(114.3)		224.3
Comprehensive income		84.5		433.7	570.8		842.0
Balance at end of period		4,299.9		3,621.9	4,299.9		3,621.9
Increase (Decrease) in Temporary Equity [Roll Forward]
Redeemable non-controlling interest adjustment		(9.2)			(14.6)
Non- controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		155.2		132.5	142.1		135.7
Stock-based compensation transactions		0.0		0.0	0.0		0.0
Repurchase of common stock		0.0		0.0	0.0		0.0
Dividends declared to Lear Corporation stockholders		0.0		0.0	0.0		0.0
Dividends declared to noncontrolling interest holders		(39.9)		(15.5)	(59.6)		(32.5)
Adoption of ASU								$ 0.0	$ 0.0	$ 0.0	$ 0.0
Affiliate transaction		0.0			14.0
Redeemable non-controlling interest adjustment		0.0			0.0
Acquisition of outstanding non-controlling interest		0.0			(3.4)
Comprehensive income
Net income		19.8		15.1	36.8		27.8
Other comprehensive income (loss), net of tax
Defined benefit plan adjustments		0.0		0.0	0.0		0.0
Derivative instruments and hedging activities		0.0			0.0
Derivative instruments and hedging activities				0.0			0.0
Foreign currency translation adjustments		(7.6)		2.2	(2.4)		3.3
Other comprehensive income (loss)		(7.6)		2.2	(2.4)		3.3
Comprehensive income		12.2		17.3	34.4		31.1
Balance at end of period		127.5		$ 134.3	127.5		$ 134.3
Increase (Decrease) in Temporary Equity [Roll Forward]
Redeemable non-controlling interest adjustment		0.0			0.0
Redeemable Non-controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redeemable non-controlling interest adjustment		9.2			14.6
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at beginning of period		170.3			153.4
Redeemable non-controlling interest adjustment		9.2			14.6
Dividends declared to noncontrolling interest holders		(4.7)			(4.7)
Comprehensive income (loss):
Net income		3.8			7.3
Foreign currency translation adjustments		(11.1)			(3.1)
Comprehensive income (loss)		(7.3)			4.2
Balance at end of period		$ 167.5			$ 167.5
[1] Unaudited.

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