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Net Income Per Share Attributable to Lear (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Oct. 01, 2016
Sep. 26, 2015
Oct. 01, 2016
Sep. 26, 2015
Earnings Per Share [Abstract]        
Net income attributable to Lear $ 214.4 $ 181.0 $ 745.2 $ 510.2
Average common shares outstanding (in shares) 71,259,766 76,259,209 73,102,327 77,315,584
Dilutive effect of common stock equivalents (in shares) 792,504 1,156,893 706,893 861,847
Average diluted shares outstanding (in shares) 72,052,270 77,416,102 73,809,220 78,177,431
Basic net income per share attributable to Lear (in dollars per share) $ 3.01 $ 2.37 $ 10.19 $ 6.60
Diluted net income per share attributable to Lear (in dollars per share) $ 2.98 $ 2.34 $ 10.10 $ 6.53