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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. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Earnings Per Share [Abstract]        
Net income attributable to Lear $ 331.4 $ 311.9 $ 685.1 $ 617.7
Less: Redeemable noncontrolling interest adjustment (9.2) 0.0 (14.6) 0.0
Net income available to Lear common stockholders $ 322.2 $ 311.9 $ 670.5 $ 617.7
Average common shares outstanding (in shares) 66,320,362 68,903,958 66,701,228 69,281,163
Dilutive effect of common stock equivalents (in shares) 387,678 544,840 431,658 606,910
Average diluted shares outstanding (in shares) 66,708,040 69,448,798 67,132,886 69,888,073
Basic net income per share available to Lear common stockholders (in dollars per share) $ 4.86 $ 4.53 $ 10.05 $ 8.92
Diluted net income per share available to Lear common stockholders (in dollars per share) $ 4.83 $ 4.49 $ 9.99 $ 8.84