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Capital Accounts, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 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 |  |  | (569.0) | 126.5
Reclassification of losses (gains) to net income during period |  |  | 535.5 | (345.0)
Total other comprehensive income (loss) for period | $ (379.7) | $ (269.4) | (33.5) | (218.5)
Accumulated Other Comprehensive Income (Loss), Ending balance | (198.7) | (147.1) | (198.7) | (147.1)
Interest expense | 316.1 | 320.2 | 638.9 | 637.7
Revenue | (9,450.1) | (5,751.0) | (18,605.4) | (13,233.5)
Operating costs and expenses | 8,066.7 | 4,370.4 | 15,620.1 | 10,430.7
Total | (1,146.0) | (1,060.8) | (2,508.6) | (2,435.8)
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 | (270.3)
Reclassification of losses (gains) to net income during period |  |  | 18.8 | 19.3
Total other comprehensive income (loss) for period |  |  | 201.7 | (251.0)
Accumulated Other Comprehensive Income (Loss), Ending balance | 127.4 | (237.1) | 127.4 | (237.1)
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 |  |  | (751.6) | 396.9
Reclassification of losses (gains) to net income during period |  |  | 516.7 | (364.3)
Total other comprehensive income (loss) for period |  |  | (234.9) | 32.6
Accumulated Other Comprehensive Income (Loss), Ending balance | (328.1) | 87.7 | (328.1) | 87.7
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 |  |  | 0.0 | 0.0
Total other comprehensive income (loss) for period |  |  | (0.3) | (0.1)
Accumulated Other Comprehensive Income (Loss), Ending balance | 2.0 | 2.3 | 2.0 | 2.3
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Total | (89.2) | (199.0) | 535.5 | (345.0)
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 | 10.2 | 9.7 | 18.8 | 19.3
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Commodity Derivatives [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Revenue | (99.3) | (209.8) | 498.1 | (364.2)
Operating costs and expenses | $ (0.1) | $ 1.1 | $ 18.6 | $ (0.1)

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