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Summary of Significant Accounting Policies - Summary of Information Used to Compute Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 26, 2015
Jun. 27, 2015
Mar. 28, 2015
Dec. 31, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]                      
Net income attributable to Lear $ 235.3 $ 181.0 $ 181.9 $ 147.3 $ 261.8 $ 140.1 $ 148.5 $ 122.0 $ 745.5 $ 672.4 $ 431.4
Average common shares outstanding (in shares)                 76,754,270 80,187,516 85,094,889
Dilutive effect of common stock equivalents (in shares)                 1,012,747 1,540,963 1,320,897
Average diluted shares outstanding (in shares)                 77,767,017 81,728,479 86,415,786
Basic net income per share attributable to Lear (in dollars per share) $ 3.13 $ 2.37 $ 2.35 $ 1.88 $ 3.32 $ 1.75 $ 1.84 $ 1.50 $ 9.71 $ 8.39 $ 5.07
Diluted net income per share attributable to Lear (in dollars per share) $ 3.07 $ 2.34 $ 2.33 $ 1.86 $ 3.24 $ 1.72 $ 1.81 $ 1.47 $ 9.59 $ 8.23 $ 4.99