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2. Foreign Exchange Forward Contracts (Details) (USD $) In Millions | 6 Months Ended
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Jun. 30, 2011
Contracts maturing in July through September 2011 to sell foreign currency |
Notional value | $ 64.2
Unrealized loss | 0.2
Contracts maturing in July through September 2011 to purchase foreign currency |
Notional value | 455.3
Unrealized loss | $ 5.8

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