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Derivative Instruments (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Derivative Instruments, Gain (Loss)    
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 2.0 $ 2.3
Designated as Hedging Instrument [Member] | Interest-rate swap
   
Derivative Instruments, Gain (Loss)    
Derivative Instruments, Gain (Loss) Recognized in Income, Net 2.0 1.8
Derivatives not designated as hedging instruments | Forward exchange contracts
   
Derivative Instruments, Gain (Loss)    
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 0 $ 0.5