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Capital Accounts, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance |  |  | $ 71.4 | $ 50.9
Other comprehensive income (loss) for period, before reclassifications |  |  | 184.9 | 34.2
Reclassification of losses (gains) to net income during period |  |  | (305.6) | (124.2)
Total other comprehensive income (loss) for period | $ 97.8 | $ (28.4) | (120.7) | (90.0)
Accumulated Other Comprehensive Income (Loss), Ending balance | (49.3) | (39.1) | (49.3) | (39.1)
Interest expense | 320.5 | 382.9 | 958.2 | 950.2
Revenue | (6,922.0) | (7,964.1) | (20,155.5) | (24,783.9)
Operating costs and expenses | 5,571.2 | 6,573.7 | 16,001.9 | 20,394.3
Total | (1,084.0) | (1,044.8) | (3,519.8) | (3,561.7)
Cash Flow Hedges [Member] | Interest Rate Derivatives [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance |  |  | 13.9 | (104.8)
Other comprehensive income (loss) for period, before reclassifications |  |  | (207.7) | (23.8)
Reclassification of losses (gains) to net income during period |  |  | 29.2 | 27.8
Total other comprehensive income (loss) for period |  |  | (178.5) | 4.0
Accumulated Other Comprehensive Income (Loss), Ending balance | (164.6) | (100.8) | (164.6) | (100.8)
Cash Flow Hedges [Member] | Commodity Derivatives [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance |  |  | 55.1 | 152.7
Other comprehensive income (loss) for period, before reclassifications |  |  | 392.7 | 58.6
Reclassification of losses (gains) to net income during period |  |  | (334.8) | (152.0)
Total other comprehensive income (loss) for period |  |  | 57.9 | (93.4)
Accumulated Other Comprehensive Income (Loss), Ending balance | 113.0 | 59.3 | 113.0 | 59.3
Other [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance |  |  | 2.4 | 3.0
Other comprehensive income (loss) for period, before reclassifications |  |  | (0.1) | (0.6)
Reclassification of losses (gains) to net income during period |  |  | 0.0 | 0.0
Total other comprehensive income (loss) for period |  |  | (0.1) | (0.6)
Accumulated Other Comprehensive Income (Loss), Ending balance | 2.3 | 2.4 | 2.3 | 2.4
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Total | 39.4 | (82.1) | (305.6) | (124.2)
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 | 9.9 | 9.4 | 29.2 | 27.8
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Commodity Derivatives [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Revenue | 19.5 | (93.6) | (344.7) | (161.4)
Operating costs and expenses | $ 10.0 | $ 2.1 | $ 9.9 | $ 9.4

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