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Financial Instruments (Foreign Exchange Risk and Its Classification on Balance Sheet) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
contract
Dec. 31, 2011
Derivatives, Fair Value    
Assets $ 1.1 $ 3.4
Liabilities 0.8 0.4
Net derivative fair value $ 0.3  
Number of swap and forward foreign exchange contracts outstanding 19