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Summary of Significant Accounting Policies - Summary of Information Used to Compute Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounting Policies [Abstract]      
Net income attributable to Lear $ 327.7 $ 373.9 $ 158.5
Average common shares outstanding (in shares) 59,674,488 60,082,833 60,254,380
Dilutive effect of common stock equivalents (in shares) 246,041 337,651 175,582
Average diluted shares outstanding (in shares) 59,920,529 60,420,484 60,429,962
Basic net income per share attributable to Lear (in dollars per share) $ 5.49 $ 6.22 $ 2.63
Diluted net income per share attributable to Lear (in dollars per share) $ 5.47 $ 6.19 $ 2.62