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Derivative Financial Instruments and Hedging Activities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2012
Derivative [Line Items]      
Derivative instruments, gain (loss) recognized in income $ 20.2 $ (30.3)  
Premiums on open commitment positions 0.1   0.5
Derivative usual settlement period 2 days    
Derivative open positions expected settlement period 30 days    
Designated as hedging instrument
     
Derivative [Line Items]      
Premiums on open commitment positions $ 0   $ 0