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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

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