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Quarterly Financial Data (unaudited) (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 5,363.8	$ 4,981.5	$ 5,123.2	$ 4,998.5	$ 4,643.5	$ 4,526.4	$ 4,724.8	$ 4,662.9	$ 20,467.0	$ 18,557.6	$ 18,211.4
Gross profit	574.9	555.9	577.8	582.5	512.1	513.9	540.4	535.7
Consolidated net income	420.4	315.0	327.0	318.5	248.5	235.0	294.5	262.5	1,380.9	1,040.5	795.8
Net income attributable to Lear	$ 400.5	$ 295.2	$ 311.9	$ 305.8	$ 229.9	$ 214.4	$ 282.4	$ 248.4	$ 1,313.4	$ 975.1	$ 745.5
Basic net income per share attributable to Lear (in dollars per share)	$ 5.89	$ 4.00	$ 4.53	$ 4.39	$ 3.28	$ 3.01	$ 3.85	$ 3.33	$ 18.79	$ 13.48	$ 9.71
Diluted net income per share attributable to Lear (in dollars per share)	$ 5.80	$ 3.96	$ 4.49	$ 4.35	$ 3.24	$ 2.98	$ 3.82	$ 3.29	$ 18.59	$ 13.33	$ 9.59

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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