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Net Income Per Share Attributable to Lear (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Earnings Per Share [Abstract]
Net income attributable to Lear	$ 295.2	$ 214.4	$ 912.9	$ 745.2
Less: Redeemable noncontrolling interest adjustment	(22.7)	0.0	(22.7)	0.0
Net income available to Lear common stockholders	$ 272.5	$ 214.4	$ 890.2	$ 745.2
Average common shares outstanding (in shares)	68,061,718	71,259,766	68,874,682	73,102,327
Dilutive effect of common stock equivalents (in shares)	772,561	792,504	662,126	706,893
Average diluted shares outstanding (in shares)	68,834,279	72,052,270	69,536,808	73,809,220
Basic net income per share available to Lear common stockholders (in dollars per share)	$ 4.00	$ 3.01	$ 12.92	$ 10.19
Diluted net income per share available to Lear common stockholders (in dollars per share)	$ 3.96	$ 2.98	$ 12.80	$ 10.10

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