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Comprehensive Income and Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 0 Months Ended
Apr. 25, 2013
Mar. 29, 2014
Jun. 29, 2013
Mar. 30, 2013
Mar. 31, 2014
Subsequent Event
Stockholders Equity Note [Line Items]          
Defined benefit plan adjustments, pension and other postretirement benefit plans       $ 2.6  
Derivative instruments and hedging activities, reclassified from accumulated other comprehensive income (loss)   (1.0)   (8.2)  
Accelerated stock repurchase agreement amount 800        
Amount paid in accelerated stock repurchase agreement     800.0   855.5
Common stock, repurchased   1,600,000,000 11,862,836    
Percentage of treasury stock repurchased     80.00%    
Value of common stock repurchased, per share     $ 53.95    
Common stock, additional shares repurchased         658,903
Additional amount paid in accelerated stock repurchase agreement         55.5
Value of common stock repurchased, average price per share         $ 72.11
Common stock, share repurchase program amount   694.5      
Cash dividends declared per share   $ 0.20   $ 0.17  
Dividends declared to Lear Corporation stockholders   17.2   16.5  
Dividends paid to Lear Corporation stockholders   $ 17.5   $ 16.2