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Comprehensive Income and Equity - Summary of Comprehensive Income and Reconciliations of Equity (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Jul. 01, 2017
Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance at beginning of period $ 3,756.2 $ 3,156.1 $ 3,192.9 $ 3,017.7    
Stock-based compensation transactions 14.9 15.6 8.4 6.7    
Repurchase of common stock (77.9) (152.7) (332.2) (557.7)    
Dividends declared to Lear Corporation stockholders (34.8) (21.9) (105.8) (67.5)    
Dividends declared to noncontrolling interest holders (0.7) (0.4) (33.2) (13.2)    
Adoption of ASU 2016-09 (Note 11, Taxes)         $ 0.0 $ 54.5
Redeemable non-controlling interest adjustment (22.7)   (22.7)      
Consolidation of affiliate   1.0   41.0    
Non-controlling interests — other   0.0   0.0    
Comprehensive income            
Net income 315.0 235.0 960.5 792.0    
Other comprehensive income (loss), net of tax            
Defined benefit plan adjustments (1.8) 1.5 (3.0) (0.2)    
Derivative instruments and hedging activities (10.8) 0.8 57.2 (10.6)    
Foreign currency translation adjustments 89.9 8.0 250.7 34.8    
Other comprehensive income (loss) 77.3 10.3 304.9 24.0    
Comprehensive income 392.3 245.3 1,265.4 816.0    
Balance at end of period 4,027.3 [1] 3,243.0 4,027.3 [1] 3,243.0    
Parent            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance at beginning of period 3,621.9 3,012.8 3,057.2 2,927.4    
Stock-based compensation transactions 14.9 15.6 8.4 6.7    
Repurchase of common stock (77.9) (152.7) (332.2) (557.7)    
Dividends declared to Lear Corporation stockholders (34.8) (21.9) (105.8) (67.5)    
Dividends declared to noncontrolling interest holders 0.0 0.0 0.0 0.0    
Adoption of ASU 2016-09 (Note 11, Taxes)         0.0 54.5
Redeemable non-controlling interest adjustment (22.7)   (22.7)      
Consolidation of affiliate   0.0   0.0    
Non-controlling interests — other   0.0   (2.2)    
Comprehensive income            
Net income 295.2 214.4 912.9 745.2    
Other comprehensive income (loss), net of tax            
Defined benefit plan adjustments (1.8) 1.5 (3.0) (0.2)    
Derivative instruments and hedging activities (10.8) 0.8 57.2 (10.6)    
Foreign currency translation adjustments 87.1 8.0 244.6 37.4    
Other comprehensive income (loss) 74.5 10.3 298.8 26.6    
Comprehensive income 369.7 224.7 1,211.7 771.8    
Balance at end of period 3,871.1 3,078.5 3,871.1 3,078.5    
Noncontrolling Interests            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance at beginning of period 134.3 143.3 135.7 90.3    
Stock-based compensation transactions 0.0 0.0 0.0 0.0    
Repurchase of common stock 0.0 0.0 0.0 0.0    
Dividends declared to Lear Corporation stockholders 0.0 0.0 0.0 0.0    
Dividends declared to noncontrolling interest holders (0.7) (0.4) (33.2) (13.2)    
Adoption of ASU 2016-09 (Note 11, Taxes)         $ 0.0 $ 0.0
Redeemable non-controlling interest adjustment 0.0   0.0      
Consolidation of affiliate   1.0   41.0    
Non-controlling interests — other   0.0   2.2    
Comprehensive income            
Net income 19.8 20.6 47.6 46.8    
Other comprehensive income (loss), net of tax            
Defined benefit plan adjustments 0.0 0.0 0.0 0.0    
Derivative instruments and hedging activities 0.0 0.0 0.0 0.0    
Foreign currency translation adjustments 2.8 0.0 6.1 (2.6)    
Other comprehensive income (loss) 2.8 0.0 6.1 (2.6)    
Comprehensive income 22.6 20.6 53.7 44.2    
Balance at end of period $ 156.2 $ 164.5 $ 156.2 $ 164.5    
[1] Unaudited.