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Derivative Financial Instruments (Details) (Foreign currency exchange forwards, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Foreign currency exchange forwards
     
Derivative Financial Instruments      
Aggregate foreign currency exchange (loss) gain $ (0.5) $ (1.0) $ 1.3
Forward contracts gain included in aggregate foreign currency exchange (loss) gain 0.3 0.5 0.1
Notional amount of derivative instruments 9.6 3.6  
Fair value of derivative instruments 0.2 0  
Weighted average notional amount of derivative contracts $ 3.5 $ 10.3