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Capital Accounts, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
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 |  |  | (669.6) | 184.9
Reclassification of losses (gains) to net income during period |  |  | 663.0 | (305.6)
Total other comprehensive income (loss) for period | $ 26.9 | $ 97.8 | (6.6) | (120.7)
Accumulated Other Comprehensive Income (Loss), Ending balance | (171.8) | (49.3) | (171.8) | (49.3)
Interest expense | 315.9 | 320.5 | 954.8 | 958.2
Revenue | (10,831.3) | (6,922.0) | (29,436.7) | (20,155.5)
Operating costs and expenses | 9,408.5 | 5,571.2 | 25,028.6 | 16,001.9
Total | (1,182.1) | (1,084.0) | (3,690.7) | (3,519.8)
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 | (207.7)
Reclassification of losses (gains) to net income during period |  |  | 29.1 | 29.2
Total other comprehensive income (loss) for period |  |  | 212.0 | (178.5)
Accumulated Other Comprehensive Income (Loss), Ending balance | 137.7 | (164.6) | 137.7 | (164.6)
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 |  |  | (852.2) | 392.7
Reclassification of losses (gains) to net income during period |  |  | 633.8 | (334.8)
Total other comprehensive income (loss) for period |  |  | (218.4) | 57.9
Accumulated Other Comprehensive Income (Loss), Ending balance | (311.6) | 113.0 | (311.6) | 113.0
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 | 2.1 | 2.3
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Total | 127.4 | 39.4 | 662.9 | (305.6)
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 | 10.3 | 9.9 | 29.1 | 29.2
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Commodity Derivatives [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Revenue | 116.8 | 19.5 | 614.9 | (344.7)
Operating costs and expenses | $ 0.3 | $ 10.0 | $ 18.9 | $ 9.9

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