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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Oct. 01, 2016
Jan. 01, 2017
Income Tax Contingency [Line Items]        
Tax benefits   $ (68.4)    
Tax benefits, release of valuation allowances with respect to deferred tax assets of certain foreign subsidiaries   28.7    
Tax benefits, share-based compensation   16.3    
Redemption of the 2023 Notes   7.5    
Tax benefits, restructuring charges and various other items   $ 15.9 $ 14.5  
Consolidation of affiliate, revaluation gain     $ 30.3  
U.S. federal statutory income tax rate   35.00% 35.00%  
Excess foreign tax credit $ 300.0 $ 300.0    
Shanghai Lear Stec Automotive Parts Co Limited        
Income Tax Contingency [Line Items]        
Consolidation of affiliate, revaluation gain $ 54.2      
Accounting Standards Update 2016-09        
Income Tax Contingency [Line Items]        
Deferred tax asset recognized       $ 54.5