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Net Income Per Share Attributable to Lear (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Earnings Per Share [Abstract]
Net income attributable to Lear	$ 353.7	$ 305.8
Less: Redeemable noncontrolling interest adjustment	(5.4)	0.0
Net income available to Lear common stockholders	$ 348.3	$ 305.8
Average common shares outstanding (in shares)	67,086,326	69,658,368
Dilutive effect of common stock equivalents (in shares)	476,126	668,980
Average diluted shares outstanding (in shares)	67,562,452	70,327,348
Basic net income per share available to Lear common stockholders (in dollars per share)	$ 5.19	$ 4.39
Diluted net income per share available to Lear common stockholders (in dollars per share)	$ 5.16	$ 4.35

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