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Derivative Instruments, Hedging Activities and Fair Value Measurements, Asset Balance Sheet Offsetting (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Interest rate derivatives [Member] |  |
Offsetting Assets [Line Items] |  |
Gross Amounts of Recognized Assets |  | $ 0.1
Gross Amounts Offset in the Balance Sheet |  | 0.0
Amounts of Assets Presented in the Balance Sheet |  | 0.1
Financial Instruments |  | (0.1)
Cash Collateral Paid |  | 0.0
Cash Collateral Received |  | 0.0
Amounts That Would Have Been Presented On Net Basis |  | 0.0
Commodity Derivatives [Member] |  |
Offsetting Assets [Line Items] |  |
Gross Amounts of Recognized Assets | $ 161.9 | 161.7
Gross Amounts Offset in the Balance Sheet | 0.0 | 0.0
Amounts of Assets Presented in the Balance Sheet | 161.9 | 161.7
Financial Instruments | (158.6) | (157.8)
Cash Collateral Paid | 0.0 | 0.0
Cash Collateral Received | 0.0 | 0.0
Amounts That Would Have Been Presented On Net Basis | $ 3.3 | $ 3.9

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