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Derivative Instruments, Hedging Activities and Fair Value Measurements, Liability Balance Sheet Offsetting (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Interest rate derivatives [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | $ 1.7 | $ 1.1
Gross Amounts Offset in the Balance Sheet | 0.0 | 0.0
Amounts of Liabilities Presented in the Balance Sheet | 1.7 | 1.1
Financial Instruments | (0.1) | (0.2)
Cash Collateral Paid | 0.0 | 0.0
Amounts That Would Have Been Presented On Net Basis | 1.6 | 0.9
Commodity Derivatives [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 176.9 | 739.4
Gross Amounts Offset in the Balance Sheet | 0.0 | 0.0
Amounts of Liabilities Presented in the Balance Sheet | 176.9 | 739.4
Financial Instruments | (157.8) | (526.8)
Cash Collateral Paid | (17.3) | (212.4)
Amounts That Would Have Been Presented On Net Basis | $ 1.8 | $ 0.2

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