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Net Income Per Share Attributable to Lear (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Apr. 03, 2021
Apr. 04, 2020
Earnings Per Share [Abstract]    
Net income available to Lear $ 203.7 $ 76.4
Average common shares outstanding (in shares) 60,312,573 60,509,450
Dilutive effect of common stock equivalents (in shares) 248,286 169,140
Average diluted shares outstanding (in shares) 60,560,859 60,678,590
Basic net income per share available to Lear common stockholders (in dollars per share) $ 3.38 $ 1.26
Diluted net income per share available to Lear common stockholders (in dollars per share) $ 3.36 $ 1.26