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General (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Derivative Instruments    
Period for which certain forecasted foreign currency rent and salary payments are hedged 12 months  
Notional amount of foreign currency forward contracts and options outstanding $ 11.6  
Net fair value balance of foreign currency forward contracts and options outstanding 0.5  
Fair value asset balance of foreign currency forward contracts and options outstanding 0.6  
Fair value liability balance of foreign currency forward contracts and options outstanding 0.1  
Period expected to be recognized in results of operations 12 months  
Gain on hedging activities 0.2 0
Cash in banks with counterparty $ 1.6