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Net Income Per Share Attributable to Lear (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income attributable to Lear	$ 228.9	$ 353.7
Less: Redeemable noncontrolling interest adjustment	(6.7)	5.4
Net income available to Lear common stockholders	$ 235.6	$ 348.3
Average common shares outstanding (in shares)	62,818,792	67,086,326
Dilutive effect of common stock equivalents (in shares)	304,405	476,126
Average diluted shares outstanding (in shares)	63,123,197	67,562,452
Basic net income per share available to Lear common stockholders (in dollars per share)	$ 3.75	$ 5.19
Diluted net income per share available to Lear common stockholders (in dollars per share)	$ 3.73	$ 5.16

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