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Schedule of Notional Amount of Derivatives (Detail) - Foreign Exchange Contracts - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Asset, Notional amounts | $ 5.0 | $ 14.5
Buy Position |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Liability, Notional amounts | (55.9) | (34.7)
Sell Position |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Asset, Notional amounts | 60.9 | 49.2
Japanese Yen |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Liability, Notional amounts | (35.7) | (17.7)
Japanese Yen | Buy Position |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Liability, Notional amounts | (35.7) | (17.7)
Taiwan Dollar |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Liability, Notional amounts | (9.9) | (6.9)
Taiwan Dollar | Buy Position |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Liability, Notional amounts | (9.9) | (6.9)
Korean Won |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Liability, Notional amounts | (8.9) | (8.8)
Korean Won | Buy Position |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Liability, Notional amounts | (8.9) | (8.8)
British Pound Sterling |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Liability, Notional amounts | (1.4) | (1.3)
British Pound Sterling | Buy Position |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Liability, Notional amounts | (1.4) | (1.3)
Singapore Dollar |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Asset, Notional amounts | 33.5 | 24.0
Singapore Dollar | Sell Position |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Asset, Notional amounts | 33.5 | 24.0
Euro |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Asset, Notional amounts | 27.4 | 25.2
Euro | Sell Position |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Derivative Asset, Notional amounts | $ 27.4 | $ 25.2

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