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v3.19.1

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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