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Derivatives and Hedging Activities (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2012
Fair value of derivatives      
Derivatives designated as hedging instruments, Asset $ 5.4   $ 2.6
Derivatives designated as hedging instruments, Liability 29.1   56.5
Interest Rate Swaps
     
Fair value of derivatives      
Total notional amounts of interest rate contracts 45.0   45.0
Net gains recorded as a reduction to interest expense 0.3 0.2  
Derivatives designated as hedging instruments, Asset     1.4
Foreign Currency Contracts
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Asset 0.3   1.2
Derivatives designated as hedging instruments, Liability 2.2   1.9
Commodity Contracts
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Asset 5.1    
Derivatives designated as hedging instruments, Liability 26.9   54.6
Other current assets
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Asset 1.9   1.4
Other current assets | Interest Rate Swaps
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Asset (0.9)   0.2
Other current assets | Foreign Currency Contracts
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Asset 0.3   1.2
Other current assets | Commodity Contracts
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Asset 2.5    
Other assets
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Asset 3.5   1.2
Other assets | Interest Rate Swaps
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Asset 0.9   1.2
Other assets | Commodity Contracts
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Asset 2.6    
Accrued liabilities
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Liability 15.0   26.5
Accrued liabilities | Foreign Currency Contracts
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Liability 1.9   1.5
Accrued liabilities | Commodity Contracts
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Liability 13.1   25.0
Other liabilities
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Liability 14.1   30.0
Other liabilities | Foreign Currency Contracts
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Liability 0.3   0.4
Other liabilities | Commodity Contracts
     
Fair value of derivatives      
Derivatives designated as hedging instruments, Liability 13.8   29.6
Cash flow hedges | Interest Rate Swaps
     
Fair value of derivatives      
Total notional amounts of interest rate contracts $ 150.0   $ 0