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3. Foreign Exchange Forward Contracts (Details)
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
Forward foreign exchange contract to sell foreign currency [Member]  
Derivatives, Fair Value [Line Items]  
Notional value $ 20.3
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 275.4
Gain (Loss) on Foreign Currency Derivative Instruments not Designated as Hedging Instruments $ 0.2