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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. 27, 2025
Sep. 28, 2024
Sep. 27, 2025
Sep. 28, 2024
Earnings Per Share [Abstract]        
Net income attributable to Lear $ 108.2 $ 135.8 $ 354.1 $ 418.5
Average common shares outstanding (in shares) 53,222,383 56,038,579 53,631,217 56,737,212
Dilutive effect of common stock equivalents (in shares) 430,880 335,256 344,944 320,256
Average diluted shares outstanding (in shares) 53,653,263 56,373,835 53,976,161 57,057,468
Basic net income per share attributable to Lear (in dollars per share) $ 2.03 $ 2.42 $ 6.60 $ 7.38
Diluted net income per share attributable to Lear (in dollars per share) $ 2.02 $ 2.41 $ 6.56 $ 7.33