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Quarterly Financial Data - Quarterly Financial Data (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 4,549.7us-gaap_SalesRevenueGoodsNet	$ 4,232.7us-gaap_SalesRevenueGoodsNet	$ 4,585.1us-gaap_SalesRevenueGoodsNet	$ 4,359.8us-gaap_SalesRevenueGoodsNet	$ 4,256.1us-gaap_SalesRevenueGoodsNet	$ 3,917.7us-gaap_SalesRevenueGoodsNet	$ 4,113.1us-gaap_SalesRevenueGoodsNet	$ 3,947.1us-gaap_SalesRevenueGoodsNet	$ 17,727.3us-gaap_SalesRevenueGoodsNet	$ 16,234.0us-gaap_SalesRevenueGoodsNet	$ 14,567.0us-gaap_SalesRevenueGoodsNet
Gross profit	392.0us-gaap_GrossProfit	361.2us-gaap_GrossProfit	379.1us-gaap_GrossProfit	360.5us-gaap_GrossProfit	319.4us-gaap_GrossProfit	330.2us-gaap_GrossProfit	337.7us-gaap_GrossProfit	312.4us-gaap_GrossProfit
Consolidated net income	268.0us-gaap_ProfitLoss	147.9us-gaap_ProfitLoss	157.8us-gaap_ProfitLoss	128.6us-gaap_ProfitLoss	79.9us-gaap_ProfitLoss	116.7us-gaap_ProfitLoss	142.3us-gaap_ProfitLoss	116.9us-gaap_ProfitLoss	702.3us-gaap_ProfitLoss	455.8us-gaap_ProfitLoss	1,317.2us-gaap_ProfitLoss
Net income attributable to Lear	$ 261.8us-gaap_NetIncomeLoss	$ 140.1us-gaap_NetIncomeLoss	$ 148.5us-gaap_NetIncomeLoss	$ 122.0us-gaap_NetIncomeLoss	$ 72.8us-gaap_NetIncomeLoss	$ 112.8us-gaap_NetIncomeLoss	$ 137.3us-gaap_NetIncomeLoss	$ 108.5us-gaap_NetIncomeLoss	$ 672.4us-gaap_NetIncomeLoss	$ 431.4us-gaap_NetIncomeLoss	$ 1,282.8us-gaap_NetIncomeLoss
Basic net income per share attributable to Lear	$ 3.32us-gaap_EarningsPerShareBasic	$ 1.75us-gaap_EarningsPerShareBasic	$ 1.84us-gaap_EarningsPerShareBasic	$ 1.50us-gaap_EarningsPerShareBasic	$ 0.90us-gaap_EarningsPerShareBasic	$ 1.40us-gaap_EarningsPerShareBasic	$ 1.62us-gaap_EarningsPerShareBasic	$ 1.14us-gaap_EarningsPerShareBasic	$ 8.39us-gaap_EarningsPerShareBasic	$ 5.07us-gaap_EarningsPerShareBasic	$ 13.04us-gaap_EarningsPerShareBasic
Diluted net income per share attributable to Lear	$ 3.24us-gaap_EarningsPerShareDiluted	$ 1.72us-gaap_EarningsPerShareDiluted	$ 1.81us-gaap_EarningsPerShareDiluted	$ 1.47us-gaap_EarningsPerShareDiluted	$ 0.88us-gaap_EarningsPerShareDiluted	$ 1.38us-gaap_EarningsPerShareDiluted	$ 1.60us-gaap_EarningsPerShareDiluted	$ 1.13us-gaap_EarningsPerShareDiluted	$ 8.23us-gaap_EarningsPerShareDiluted	$ 4.99us-gaap_EarningsPerShareDiluted	$ 12.85us-gaap_EarningsPerShareDiluted

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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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