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Net Income Per Share Attributable to Lear (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Earnings Per Share [Abstract]        
Net income attributable to Lear $ 181.0 $ 140.1 $ 510.2 $ 410.6
Average common shares outstanding (in shares) 76,259,209 79,974,811 77,315,584 80,652,376
Dilutive effect of common stock equivalents (in shares) 1,156,893 1,428,414 861,847 1,374,751
Average diluted shares outstanding (in shares) 77,416,102 81,403,225 78,177,431 82,027,127
Basic net income per share attributable to Lear (in dollars per share) $ 2.37 $ 1.75 $ 6.60 $ 5.09
Diluted net income per share attributable to Lear (in dollars per share) $ 2.34 $ 1.72 $ 6.53 $ 5.01