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Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial assets [Abstract] |  |
Interest rate derivatives |  | $ 12.4
Value before application of CME Rule 814 | $ 1,877.8 | 1,570.1
Impact of CME Rule 814 | (1,552.9) | (1,340.9)
Total commodity derivatives | 324.9 | 229.2
Total | 324.9 | 241.6
Financial liabilities [Abstract] |  |
Interest rate derivatives |  | 120.1
Commodity derivatives: |  |
Value before application of CME Rule 814 | 2,218.5 | 2,138.9
Impact of CME Rule 814 | (1,969.0) | (1,892.6)
Total commodity derivatives | 249.5 | 246.3
Total | 249.5 | 366.4
Net value before application of CME Rule 814 to commodity hedging portfolio | (340.7) |
Level 1 [Member] |  |
Financial assets [Abstract] |  |
Interest rate derivatives |  | 0.0
Value before application of CME Rule 814 | 719.7 | 678.6
Impact of CME Rule 814 | (719.7) | (678.6)
Total commodity derivatives | 0.0 | 0.0
Total | 0.0 | 0.0
Financial liabilities [Abstract] |  |
Interest rate derivatives |  | 0.0
Commodity derivatives: |  |
Value before application of CME Rule 814 | 1,270.7 | 1,065.6
Impact of CME Rule 814 | (1,270.7) | (1,065.6)
Total commodity derivatives | 0.0 | 0.0
Total | 0.0 | 0.0
Level 2 [Member] |  |
Financial assets [Abstract] |  |
Interest rate derivatives |  | 12.4
Value before application of CME Rule 814 | 1,155.6 | 878.6
Impact of CME Rule 814 | (831.9) | (650.4)
Total commodity derivatives | 323.7 | 228.2
Total | 323.7 | 240.6
Financial liabilities [Abstract] |  |
Interest rate derivatives |  | 120.1
Commodity derivatives: |  |
Value before application of CME Rule 814 | 947.3 | 1,047.4
Impact of CME Rule 814 | (698.2) | (807.3)
Total commodity derivatives | 249.1 | 240.1
Total | 249.1 | 360.2
Level 3 [Member] |  |
Financial assets [Abstract] |  |
Interest rate derivatives |  | 0.0
Value before application of CME Rule 814 | 2.5 | 12.9
Impact of CME Rule 814 | (1.3) | (11.9)
Total commodity derivatives | 1.2 | 1.0
Total | 1.2 | 1.0
Financial liabilities [Abstract] |  |
Interest rate derivatives |  | 0.0
Commodity derivatives: |  |
Value before application of CME Rule 814 | 0.5 | 25.9
Impact of CME Rule 814 | (0.1) | (19.7)
Total commodity derivatives | 0.4 | 6.2
Total | $ 0.4 | $ 6.2

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