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Fair Value Measurements (Details 1) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Summary of cumulative gains and losses on the interest rate swaps and commodity swaps    
Balance at January 1 $ 0.1 $ 1.2
Change in fair value 0 (1.1)
Balance at December 31 $ 0.1 $ 0.1