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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 |

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