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Derivative Instruments, Hedging Activities and Fair Value Measurements, Asset Balance Sheet Offsetting (Details) - Commodity Derivatives [Member] - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 138.4	$ 161.9
Gross Amounts Offset in the Balance Sheet	0.0	0.0
Amounts of Assets Presented in the Balance Sheet	138.4	161.9
Financial Instruments	(108.1)	(158.6)
Cash Collateral Received	0.0	0.0
Cash Collateral Paid	0.0	0.0
Amounts That Would Have Been Presented On Net Basis	$ 30.3	$ 3.3

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

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

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