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Derivatives (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Amounts related to cash flow hedges    
Expense for (benefit from) income taxes $ (1.0) $ (0.2)
Commodity Price Hedges [Member] | Cash Flow Hedging [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), before Tax 2.7 0.8
Amounts related to cash flow hedges    
Losses (gains) included in AOCI, net of tax $ 1.7 $ 0.6