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Net Income Per Share Attributable to Lear (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Earnings Per Share [Abstract]        
Net income attributable to Lear $ 181.9 $ 148.5 $ 329.2 $ 270.5
Average common shares outstanding (in shares) 77,478,053 80,920,465 77,855,641 80,996,837
Dilutive effect of common stock equivalents (in shares) 598,194 1,020,307 711,008 1,347,469
Average diluted shares outstanding (in shares) 78,076,247 81,940,772 78,566,649 82,344,306
Basic net income per share attributable to Lear (in dollars per share) $ 2.35 $ 1.84 $ 4.23 $ 3.34
Diluted net income per share attributable to Lear (in dollars per share) $ 2.33 $ 1.81 $ 4.19 $ 3.28