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Derivative Instruments, Hedging Activities and Fair Value Measurements, Liability Balance Sheet Offsetting (Details) (Commodity derivatives [Member], USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Commodity derivatives [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | $ 51.9 | $ 45.5
Gross Amounts Offset in the Balance Sheet | 0 | 0
Amounts of Liabilities Presented in the Balance Sheet | 51.9 | 45.5
Financial Instruments | (44.9) | (38.7)
Cash Collateral Paid | 0 | (4.3)
Amounts That Would Have Been Presented On Net Basis | $ 7.0 | $ 2.5

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