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Derivatives (Details) (Cash Flow Hedging [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Commodity Price Hedges [Member]
   
Amounts related to cash flow hedges    
(Gains) losses included in AOCI, net of tax $ (2.3) $ 6.1
Expense for (benefit from) income taxes 1.3 (3.5)
Interest Rate Swap [Member]
   
Amounts related to cash flow hedges    
(Gains) losses included in AOCI, net of tax 0.1 1.1
Expense for (benefit from) income taxes $ 0 $ (0.6)