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Comprehensive Income and Equity - Summary of Comprehensive Income and Reconciliations of Equity (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Dec. 31, 2017
Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period $ 4,292.6 $ 3,192.9    
Stock-based compensation transactions (31.2) (25.8)    
Repurchase of common stock (155.4) (127.5)    
Dividends declared to Lear Corporation stockholders (47.7) (35.7)    
Dividends declared to noncontrolling interest holders (19.7) (17.0)    
Adoption of ASU     $ 2.3 $ 54.5
Affiliate transaction 14.0      
Redeemable non-controlling interest adjustment (5.4)      
Acquisition of outstanding non-controlling interest (3.4)      
Comprehensive income        
Net income 370.7 318.5    
Other comprehensive income (loss), net of tax        
Defined benefit plan adjustments 2.3 0.7    
Derivative instruments and hedging activities 37.4 52.1    
Foreign currency translation adjustments 98.1 50.8    
Other comprehensive income (loss) 137.8 103.6    
Comprehensive income 508.5 422.1    
Balance at end of period 4,554.6 [1] 3,463.5    
Increase (Decrease) in Temporary Equity [Roll Forward]        
Balance at beginning of period 153.4      
Redeemable non-controlling interest adjustment (5.4)      
Comprehensive income        
Balance at end of period [1] 170.3      
Lear Corporation Stockholders' Equity        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period 4,150.5 3,057.2    
Stock-based compensation transactions (31.2) (25.8)    
Repurchase of common stock (155.4) (127.5)    
Dividends declared to Lear Corporation stockholders (47.7) (35.7)    
Dividends declared to noncontrolling interest holders 0.0 0.0    
Adoption of ASU     2.3 54.5
Affiliate transaction 0.0      
Redeemable non-controlling interest adjustment (5.4)      
Acquisition of outstanding non-controlling interest 0.0      
Comprehensive income        
Net income 353.7 305.8    
Other comprehensive income (loss), net of tax        
Defined benefit plan adjustments 2.3 0.7    
Derivative instruments and hedging activities 37.4 52.1    
Foreign currency translation adjustments 92.9 49.7    
Other comprehensive income (loss) 132.6 102.5    
Comprehensive income 486.3 408.3    
Balance at end of period 4,399.4 3,331.0    
Increase (Decrease) in Temporary Equity [Roll Forward]        
Redeemable non-controlling interest adjustment (5.4)      
Non- controlling Interests        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period 142.1 135.7    
Stock-based compensation transactions 0.0 0.0    
Repurchase of common stock 0.0 0.0    
Dividends declared to Lear Corporation stockholders 0.0 0.0    
Dividends declared to noncontrolling interest holders (19.7) (17.0)    
Adoption of ASU     $ 0.0 $ 0.0
Affiliate transaction 14.0      
Redeemable non-controlling interest adjustment 0.0      
Acquisition of outstanding non-controlling interest (3.4)      
Comprehensive income        
Net income 17.0 12.7    
Other comprehensive income (loss), net of tax        
Defined benefit plan adjustments 0.0 0.0    
Derivative instruments and hedging activities 0.0 0.0    
Foreign currency translation adjustments 5.2 1.1    
Other comprehensive income (loss) 5.2 1.1    
Comprehensive income 22.2 13.8    
Balance at end of period 155.2 $ 132.5    
Increase (Decrease) in Temporary Equity [Roll Forward]        
Redeemable non-controlling interest adjustment 0.0      
Redeemable Non-controlling Interests        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Redeemable non-controlling interest adjustment 5.4      
Increase (Decrease) in Temporary Equity [Roll Forward]        
Balance at beginning of period 153.4      
Redeemable non-controlling interest adjustment 5.4      
Comprehensive income        
Net income 3.5      
Foreign currency translation adjustments 8.0      
Comprehensive income 11.5      
Balance at end of period $ 170.3      
[1] Unaudited.