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Summary of Information Used to Compute Diluted Net Income Per Share (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 31, 2012
Sep. 29, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]                      
Net income attributable to Lear $ 72.8 $ 112.8 $ 137.3 $ 108.5 $ 881.9 $ 121.4 $ 145.4 $ 134.1 $ 431.4 $ 1,282.8 $ 540.7
Average common shares outstanding                 85,094,889 98,388,228 103,750,223
Dilutive effect of common stock equivalents                 1,320,897 1,437,458 2,594,144
Average diluted shares outstanding                 86,415,786 99,825,686 106,344,367
Diluted net income per share attributable to Lear $ 0.88 $ 1.38 $ 1.60 $ 1.13 $ 9.00 $ 1.23 $ 1.45 $ 1.32 $ 4.99 $ 12.85 $ 5.08