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Summary of Significant Accounting Policies - Summary of Information Used to Compute Basic Net Income Per Share (Detail) (USD $) In Millions, except 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
Earnings Per Share [Abstract]
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
Average common shares outstanding									80,187,516	85,094,889	98,388,228
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

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

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.