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Derivative Instruments, Hedging Activities and Fair Value Measurements, Liability Balance Sheet Offsetting (Details) - Commodity derivatives [Member] - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 197.1	$ 147.4
Gross Amounts Offset in the Balance Sheet	0.0	0.0
Amounts of Liabilities Presented in the Balance Sheet	197.1	147.4
Financial Instruments	(180.3)	(147.3)
Cash Collateral Paid	0.0	0.0
Amounts That Would Have Been Presented On Net Basis	$ 16.8	$ 0.1

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The amount of the derivative asset to be cleared under master netting arrangements that have not been offset against net derivative instrument positions.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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