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Net Income Per Share Attributable to Lear (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Earnings Per Share [Abstract]        
Net income attributable to Lear $ 215.9 $ 252.5 $ 627.6 $ 937.6
Redeemable noncontrolling interest adjustment 3.6 (2.3) 9.4 (16.9)
Net income available to Lear common stockholders $ 219.5 $ 250.2 $ 637.0 $ 920.7
Average common shares outstanding (in shares) 61,133,723 65,372,829 62,042,156 66,256,800
Dilutive effect of common stock equivalents (in shares) 196,363 495,831 220,747 453,128
Average diluted shares outstanding (in shares) 61,330,086 65,868,660 62,262,903 66,709,928
Basic net income per share available to Lear common stockholders (in dollars per share) $ 3.59 $ 3.83 $ 10.27 $ 13.90
Diluted net income per share available to Lear common stockholders (in dollars per share) $ 3.58 $ 3.80 $ 10.23 $ 13.80