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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
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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 | $ 261.8 us-gaap_NetIncomeLoss | $ 140.1 us-gaap_NetIncomeLoss | $ 148.5 us-gaap_NetIncomeLoss | $ 122.0 us-gaap_NetIncomeLoss | $ 72.8 us-gaap_NetIncomeLoss | $ 112.8 us-gaap_NetIncomeLoss | $ 137.3 us-gaap_NetIncomeLoss | $ 108.5 us-gaap_NetIncomeLoss | $ 672.4 us-gaap_NetIncomeLoss | $ 431.4 us-gaap_NetIncomeLoss | $ 1,282.8 us-gaap_NetIncomeLoss
Average common shares outstanding |  |  |  |  |  |  |  |  | 80,187,516 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 85,094,889 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 98,388,228 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net income per share attributable to Lear | $ 3.32 us-gaap_EarningsPerShareBasic | $ 1.75 us-gaap_EarningsPerShareBasic | $ 1.84 us-gaap_EarningsPerShareBasic | $ 1.50 us-gaap_EarningsPerShareBasic | $ 0.90 us-gaap_EarningsPerShareBasic | $ 1.40 us-gaap_EarningsPerShareBasic | $ 1.62 us-gaap_EarningsPerShareBasic | $ 1.14 us-gaap_EarningsPerShareBasic | $ 8.39 us-gaap_EarningsPerShareBasic | $ 5.07 us-gaap_EarningsPerShareBasic | $ 13.04 us-gaap_EarningsPerShareBasic

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