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Summary of Information Used to Compute Basic and Diluted Net Income Per Share (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
Jun. 29, 2013
Earnings Per Share [Abstract]        
Net income attributable to Lear $ 148.5 $ 137.3 $ 270.5 $ 245.8
Average common shares outstanding 80,920,465 84,517,205 80,996,837 89,609,759
Dilutive effect of common stock equivalents 1,020,307 1,033,769 1,347,469 1,043,946
Average diluted shares outstanding 81,940,772 85,550,974 82,344,306 90,653,705
Basic net income per share attributable to Lear $ 1.84 $ 1.62 $ 3.34 $ 2.74
Diluted net income per share attributable to Lear $ 1.81 $ 1.60 $ 3.28 $ 2.71