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Summary of Significant Accounting Policies - Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Roll Forward]    
Beginning balance $ 726.2 $ 757.2
Acquisitions 370.7  
Foreign currency translation and other (43.1) (31.0)
Ending balance 1,053.8 726.2
Seating    
Goodwill [Roll Forward]    
Beginning balance 726.2 757.2
Acquisitions 343.7  
Foreign currency translation and other (43.1) (31.0)
Ending balance 1,026.8 726.2
Electrical    
Goodwill [Roll Forward]    
Beginning balance 0.0 0.0
Acquisitions 27.0  
Foreign currency translation and other 0.0 0.0
Ending balance $ 27.0 $ 0.0