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v3.25.2

Subsequent Events - Narrative (Details) - Long-term Debt - Subsequent Event - SIGECO - USD ($) $ in Millions |  | 1 Months Ended
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Jul. 01, 2025 | Jul. 24, 2025
First Mortgage Bonds 3.45% Due 2025 | First Mortgage Bonds |  |
Subsequent Event [Line Items] |  |
Aggregate principal |  | $ 41
Annual interest rate (as a percent) |  | 3.45%
Debt instrument, redemption price, percentage |  | 100.00%
5.09%, Series 2025B, Tranche A Due 2031 | First Mortgage Bonds |  |
Subsequent Event [Line Items] |  |
Aggregate principal | $ 100 |
Annual interest rate (as a percent) | 5.09% |
5.52%, Series 2025B, Tranche A Due 2035 | First Mortgage Bonds |  |
Subsequent Event [Line Items] |  |
Aggregate principal | $ 105 |
Annual interest rate (as a percent) | 5.52% |
5.77%, Series 2025C, Tranche A Due 2040 | First Mortgage Bonds |  |
Subsequent Event [Line Items] |  |
Aggregate principal | $ 45 |
Annual interest rate (as a percent) | 5.77% |
Number of business days | 5 days |
6.18%, Series 2025C, Tranche B Due 2055 | First Mortgage Bonds |  |
Subsequent Event [Line Items] |  |
Aggregate principal | $ 100 |
Annual interest rate (as a percent) | 6.18% |
Series 2025B Bonds |  |
Subsequent Event [Line Items] |  |
Aggregate principal | $ 205 |

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