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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
Mar. 29, 2014
Mar. 30, 2013
Earnings Per Share [Abstract]    
Net income attributable to Lear $ 122.0 $ 108.5
Average common shares outstanding 81,075,811 94,816,752
Dilutive effect of common stock equivalents 1,685,786 1,054,352
Average diluted shares outstanding 82,761,597 95,871,104
Basic net income per share attributable to Lear $ 1.50 $ 1.14
Diluted net income per share attributable to Lear $ 1.47 $ 1.13