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Quarterly Financial Data (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 31, 2012
Sep. 29, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 4,256.1 $ 3,917.7 $ 4,113.1 $ 3,947.1 $ 3,719.4 $ 3,538.6 $ 3,665.0 $ 3,644.0 $ 16,234.0 $ 14,567.0 $ 14,156.5
Gross profit 319.4 330.2 337.7 312.4 301.8 291.3 314.6 309.8      
Consolidated net income 79.9 116.7 142.3 116.9 890.1 128.1 154.6 144.4 455.8 1,317.2 570.4
Net income attributable to Lear $ 72.8 $ 112.8 $ 137.3 $ 108.5 $ 881.9 $ 121.4 $ 145.4 $ 134.1 $ 431.4 $ 1,282.8 $ 540.7
Basic net income per share attributable to Lear $ 0.90 $ 1.40 $ 1.62 $ 1.14 $ 9.12 $ 1.25 $ 1.47 $ 1.34 $ 5.07 $ 13.04 $ 5.21
Diluted net income per share attributable to Lear $ 0.88 $ 1.38 $ 1.60 $ 1.13 $ 9.00 $ 1.23 $ 1.45 $ 1.32 $ 4.99 $ 12.85 $ 5.08