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Contingencies (Details)
In Millions, unless otherwise specified
3 Months Ended
Apr. 30, 2009
USD ($)
Apr. 30, 2009
EUR (€)
Dec. 31, 2011
USD ($)
Dec. 31, 2011
Standby Letters of Credit [Member]
USD ($)
Dec. 31, 2011
Guarantees [Member]
USD ($)
Contingencies [Abstract]          
Fine levied and paid related to competition investigation $ 55.9 € 42.0      
Loss Contingencies [Line Items]          
Guarantee contracts and stand-by letters of credit     $ 174.0 $ 38.6 $ 135.4