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Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Total gains (losses) included in: |  |  |  |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities |  | $ 27.4 | $ 79.3 | $ (27.2)
Fair Value, Measurements, Recurring [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Interest rate derivatives |  |  | 12.4 |
Value before application of CME Rule 814 |  | 1,231.3 | 1,570.1 |
Impact of CME Rule 814 |  | (992.8) | (1,340.9) |
Total commodity derivatives |  | 238.5 | 229.2 |
Total |  | 238.5 | 241.6 |
Financial liabilities [Abstract] |  |  |  |
Interest rate derivatives |  |  | 120.1 |
Commodity derivatives: |  |  |  |
Value before application of CME Rule 814 |  | 1,199.5 | 2,138.9 |
Impact of CME Rule 814 |  | (943.8) | (1,892.6) |
Total commodity derivatives |  | 255.7 | 246.3 |
Total |  | 255.7 | 366.4 |
Net value before application of CME Rule 814 to commodity hedging portfolio |  | 31.8 |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Interest rate derivatives |  |  | 0.0 |
Value before application of CME Rule 814 |  | 121.9 | 678.6 |
Impact of CME Rule 814 |  | (121.9) | (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 |  | 198.9 | 1,065.6 |
Impact of CME Rule 814 |  | (198.9) | (1,065.6) |
Total commodity derivatives |  | 0.0 | 0.0 |
Total |  | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Interest rate derivatives |  |  | 12.4 |
Value before application of CME Rule 814 |  | 1,109.4 | 878.6 |
Impact of CME Rule 814 |  | (870.9) | (650.4) |
Total commodity derivatives |  | 238.5 | 228.2 |
Total |  | 238.5 | 240.6 |
Financial liabilities [Abstract] |  |  |  |
Interest rate derivatives |  |  | 120.1 |
Commodity derivatives: |  |  |  |
Value before application of CME Rule 814 |  | 1,000.3 | 1,047.4 |
Impact of CME Rule 814 |  | (744.9) | (807.3) |
Total commodity derivatives |  | 255.4 | 240.1 |
Total |  | 255.4 | 360.2 |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Interest rate derivatives |  |  | 0.0 |
Value before application of CME Rule 814 |  | 0.0 | 12.9 |
Impact of CME Rule 814 |  | 0.0 | (11.9) |
Total commodity derivatives |  | 0.0 | 1.0 |
Total |  | 0.0 | 1.0 |
Financial liabilities [Abstract] |  |  |  |
Interest rate derivatives |  |  | 0.0 |
Commodity derivatives: |  |  |  |
Value before application of CME Rule 814 |  | 0.3 | 25.9 |
Impact of CME Rule 814 |  | 0.0 | (19.7) |
Total commodity derivatives |  | 0.3 | 6.2 |
Total |  | 0.3 | 6.2 |
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward] |  |  |  |
Financial liability balance, net, beginning of period |  | (5.2) | (509.8) |
Total gains (losses) included in: |  |  |  |
Transfer out of Level 3 - Liquidity Option | [1] | 0.0 | 511.9 |
Other transfers out of Level 3 |  | 5.8 | 17.1 |
Financial liability balance, net, end of period |  | (0.3) | (5.2) | $ (509.8)
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities |  | (0.8) | 0.7 |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |
Total gains (losses) included in: |  |  |  |
Other comprehensive income (loss) |  | (0.2) | (23.7) |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Revenue [Member] |  |  |  |
Total gains (losses) included in: |  |  |  |
Net income | [2] | 0.7 | (1.6) |
Settlements | [2] | (1.4) | 3.2 |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Expense [Member] |  |  |  |
Total gains (losses) included in: |  |  |  |
Net income |  | $ 0.0 | $ (2.3) |
[1] | In March 2020, the Liquidity Option settled and was transferred out of Level 3. See Note 8 for information regarding the Liquidity Option.
[2] | There were unrealized losses of $0.8 million and unrealized gains of $0.7 million included in these amounts for the years ended December 31, 2021 and 2020, respectively.

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