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Subsequent Events (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) GWh | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Equity Method Investment | $ 1,073.6 | $ 1,276.7 | $ 1,447.5
Equity Method Investment, Ownership Percentage | 50.00% |  |
Generation and Marketing [Member] |  |  |
Equity Method Investment | $ 100.6 | $ 337.6 | $ 487.8
Competitive Contracted Renewables | Generation and Marketing [Member] |  |  |
Contracted Renewables GWs | GWh | 1.4 |  |
Competitive Contracted Renewables NBV | $ 1,200.0 |  |
Equity Method Investment | 247.0 |  |
Proceeds from Sales of Assets | $ 1,200.0 |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |
Subsequent Event [Member] | Competitive Contracted Renewables | Generation and Marketing [Member] |  |  |
Enterprise Value | $ 1,500.0 |  |
Indemnification | 70.0 |  |
Proceeds from Sales of Assets | 1,200.0 |  |
Anticipated Pretax Loss Range Lower | 175.0 |  |
Anticipated Pretax Loss Range Upper | 225.0 |  |
Anticipated After Tax Loss Range Lower | 100.0 |  |
Anticipated After Tax Loss Range Upper | $ 150.0 |  |

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