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2. Foreign Exchange Forward Contracts (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Forward foreign exchange contract to sell foreign currency [Member]  
Derivatives, Fair Value [Line Items]  
Notional value $ 37.5
Gain (Loss) on Foreign Currency Derivative Instruments not Designated as Hedging Instruments 0.0
Forward foreign exchange contract to purchase foreign currency [Member]  
Derivatives, Fair Value [Line Items]  
Notional value 355.3
Gain (Loss) on Foreign Currency Derivative Instruments not Designated as Hedging Instruments $ (0.1)