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Schedule of Notional Amount of Derivatives (Detail) - Foreign Currency Forward Contracts - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts $ (29.7) $ 10.0
Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (71.9) (31.5)
Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts 42.2 41.5
Japanese Yen    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (51.9) 19.7
Japanese Yen | Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (51.9)  
Japanese Yen | Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts   19.7
British Pound Sterling    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (9.5) 11.7
British Pound Sterling | Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (9.5)  
British Pound Sterling | Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts   11.7
Korean Won    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (5.5) 4.4
Korean Won | Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (5.5)  
Korean Won | Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts   4.4
Taiwan Dollar    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (5.0) 4.8
Taiwan Dollar | Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (5.0) (0.9)
Taiwan Dollar | Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts   5.7
Euro    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts 27.2 (30.6)
Euro | Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts   $ (30.6)
Euro | Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts 27.2  
Singapore Dollar    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts 15.0  
Singapore Dollar | Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts $ 15.0