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Derivatives (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]    
Expense for (benefit from) income taxes $ (0.2) $ 0.7
Commodity Price Hedges [Member] | Cash Flow Hedging [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), before Tax 0.8 (1.8)
(Gains) losses included in AOCI, net of tax $ 0.6 $ (1.1)