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Net Income Per Share Attributable to Lear (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jul. 02, 2016
Jun. 27, 2015
Jul. 02, 2016
Jun. 27, 2015
Earnings Per Share [Abstract]        
Net income attributable to Lear $ 282.4 $ 181.9 $ 530.8 $ 329.2
Average common shares outstanding (in shares) 73,322,857 77,478,053 74,013,593 77,855,641
Dilutive effect of common stock equivalents (in shares) 541,600 598,194 664,554 711,008
Average diluted shares outstanding (in shares) 73,864,457 78,076,247 74,678,147 78,566,649
Basic net income per share attributable to Lear (in dollars per share) $ 3.85 $ 2.35 $ 7.17 $ 4.23
Diluted net income per share attributable to Lear (in dollars per share) $ 3.82 $ 2.33 $ 7.11 $ 4.19