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Net Income Per Share Attributable to Lear (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 29, 2025
Mar. 30, 2024
Earnings Per Share [Abstract]    
Net income attributable to Lear $ 80.7 $ 109.6
Average common shares outstanding (in shares) 53,916,073 57,251,970
Dilutive effect of common stock equivalents (in shares) 311,321 317,769
Average diluted shares outstanding (in shares) 54,227,394 57,569,739
Basic net income per share attributable to Lear (in dollars per share) $ 1.50 $ 1.91
Diluted net income per share attributable to Lear (in dollars per share) $ 1.49 $ 1.90