3. Foreign Exchange Forward Contracts (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Derivatives, Fair Value [Line Items]
Unrealized gain or loss on contracts maturing in July through September 2014 to sell foreign currency	$ 0.2
Unrealized gain or loss on contracts maturing in July through September 2014 to purchase foreign currency	(0.2)
Forward foreign exchange contract to sell foreign currency [Member]
Derivatives, Fair Value [Line Items]
Notional value	89.4
Forward foreign exchange contract to purchase foreign currency [Member]
Derivatives, Fair Value [Line Items]
Notional value	$ 383.6