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Net Income (Loss) Per Share Attributable to Lear (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jul. 03, 2021
Jul. 04, 2020
Jul. 03, 2021
Jul. 04, 2020
Earnings Per Share [Abstract]        
Net income (loss) available to Lear $ 175.2 $ (293.9) $ 378.9 $ (217.5)
Average common shares outstanding (in shares) 60,292,000 60,102,925 60,302,398 60,310,559
Dilutive effect of common stock equivalents (in shares) 319,505 0 283,509 0
Average diluted shares outstanding (in shares) 60,611,505 60,102,925 60,585,907 60,310,559
Basic net income (loss) per share available to Lear common stockholders (in dollars per share) $ 2.91 $ (4.89) $ 6.28 $ (3.61)
Diluted net income (loss) per share available to Lear common stockholders (in dollars per share) $ 2.89 $ (4.89) $ 6.25 $ (3.61)