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2. Foreign Exchange Forward Contracts (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Forward foreign exchange contract to sell foreign currency [Member] |
Derivatives, Fair Value [Line Items] |
Notional value | $ 37.8
Gain (Loss) on Foreign Currency Derivative Instruments not Designated as Hedging Instruments | (0.1)
Forward foreign exchange contract to purchase foreign currency [Member] |
Derivatives, Fair Value [Line Items] |
Notional value | 327.6
Gain (Loss) on Foreign Currency Derivative Instruments not Designated as Hedging Instruments | $ (0.5)

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