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Derivative Instruments, Hedging Activities and Fair Value Measurements, Liability Balance Sheet Offsetting (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Interest rate derivatives [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | $ 1.6 | $ 1.7
Gross Amounts Offset in the Balance Sheet | 0.0 | 0.0
Amounts of Liabilities Presented in the Balance Sheet | 1.6 | 1.7
Financial Instruments | (0.3) | (0.1)
Cash Collateral Received | 0.0 | 0.0
Cash Collateral Paid | 0.0 | 0.0
Amounts That Would Have Been Presented On Net Basis | 1.3 | 1.6
Commodity Derivatives [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 183.0 | 176.9
Gross Amounts Offset in the Balance Sheet | 0.0 | 0.0
Amounts of Liabilities Presented in the Balance Sheet | 183.0 | 176.9
Financial Instruments | (84.6) | (157.8)
Cash Collateral Received | 0.0 | 0.0
Cash Collateral Paid | (97.9) | (17.3)
Amounts That Would Have Been Presented On Net Basis | $ 0.5 | $ 1.8

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