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3. Fair Value Measurements Foreign Exchange Forward Contracts (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Contracts maturing in January through March 2013 to sell foreign currency |
Notional value | $ 67.2
Unrealized loss | (0.2)
Contracts maturing in January through March 2013 to purchase foreign currency |
Notional value | 389.1
Unrealized gain | $ 0.4

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