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Schedule of Notional Amount of Derivatives (Detail) - Foreign Exchange Contracts - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Intercompany Foreign Currency Balance [Line Items]    
Derivative Asset, Notional amounts $ 48.7 $ 5.0
Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Liability, Notional amounts (57.2) (55.9)
Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Asset, Notional amounts 105.9 60.9
Japanese Yen    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Liability, Notional amounts (35.0) (35.7)
Japanese Yen | Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Liability, Notional amounts (35.0) (35.7)
Taiwan Dollar    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Liability, Notional amounts (11.2) (9.9)
Taiwan Dollar | Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Liability, Notional amounts (11.2) (9.9)
Korean Won    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Liability, Notional amounts (9.6) (8.9)
Korean Won | Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Liability, Notional amounts (9.6) (8.9)
British Pound Sterling    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Liability, Notional amounts (1.4) (1.4)
British Pound Sterling | Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Liability, Notional amounts (1.4) (1.4)
Euro    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Asset, Notional amounts 82.2 27.4
Euro | Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Asset, Notional amounts 82.2 27.4
Singapore Dollar    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Asset, Notional amounts 15.7 33.5
Singapore Dollar | Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Asset, Notional amounts 15.7 $ 33.5
Philippines, Pesos    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Asset, Notional amounts 5.2  
Philippines, Pesos | Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Asset, Notional amounts 5.2  
China, Yuan Renminbi    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Asset, Notional amounts 2.8  
China, Yuan Renminbi | Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Derivative Asset, Notional amounts $ 2.8