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Capital Accounts, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | $ (165.2) | $ 71.4 |
Other comprehensive income (loss) for period, before reclassifications | (495.1) | (3.2) |
Reclassification of losses (gains) to net income during period | 946.2 | (233.4) |
Total other comprehensive income (loss) for period | 451.1 | (236.6) | $ 20.5
Accumulated Other Comprehensive Income (Loss), Ending balance | 285.9 | (165.2) | 71.4
Interest expense | 1,283.0 | 1,287.4 | 1,243.0
Revenue | (40,806.9) | (27,199.7) | (32,789.2)
Operating costs and expenses | 35,077.3 | 22,371.1 | 27,061.8
Total | (4,755.3) | (3,885.7) | (4,687.1)
Cash Flow Hedges [Member] | Commodity Derivatives [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (93.2) | 55.1 |
Other comprehensive income (loss) for period, before reclassifications | (677.7) | 124.4 |
Reclassification of losses (gains) to net income during period | 907.8 | (272.7) |
Total other comprehensive income (loss) for period | 230.1 | (148.3) |
Accumulated Other Comprehensive Income (Loss), Ending balance | 136.9 | (93.2) | 55.1
Cash Flow Hedges [Member] | Interest Rate Derivatives [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (74.3) | 13.9 |
Other comprehensive income (loss) for period, before reclassifications | 182.9 | (127.5) |
Reclassification of losses (gains) to net income during period | 38.3 | 39.3 |
Total other comprehensive income (loss) for period | 221.2 | (88.2) |
Accumulated Other Comprehensive Income (Loss), Ending balance | 146.9 | (74.3) | 13.9
Other [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 2.3 | 2.4 |
Other comprehensive income (loss) for period, before reclassifications | (0.3) | (0.1) |
Reclassification of losses (gains) to net income during period | 0.1 | 0.0 |
Total other comprehensive income (loss) for period | (0.2) | (0.1) |
Accumulated Other Comprehensive Income (Loss), Ending balance | 2.1 | 2.3 | $ 2.4
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Total | 946.1 | (233.4) |
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Commodity Derivatives [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Revenue | 893.3 | (282.6) |
Operating costs and expenses | 14.5 | 9.9 |
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Interest Rate Derivatives [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Interest expense | $ 38.3 | $ 39.3 |

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