Derivative Instruments and Hedging Activities, Pro Forma Impact - Offsetting Collateral (Details) - USD ($) $ in Millions |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Derivative Asset [Abstract] | ||
| Gross collateral | $ 46.1 | $ 3.5 |
| Counterparties with Offsetting Positions or Collateral [Member] | ||
| Derivative Asset [Abstract] | ||
| Gross collateral | 46.1 | 3.5 |
| Current Assets from Risk Management Activities [Member] | ||
| Derivative Asset [Abstract] | ||
| Gross collateral | 37.1 | 3.6 |
| Current Assets from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member] | ||
| Derivative Asset [Abstract] | ||
| Gross collateral | 37.1 | 3.6 |
| Other Long-term Assets [Member] | ||
| Derivative Asset [Abstract] | ||
| Gross collateral | 9.0 | (0.1) |
| Other Long-term Assets [Member] | Counterparties with Offsetting Positions or Collateral [Member] | ||
| Derivative Asset [Abstract] | ||
| Gross collateral | $ 9.0 | $ (0.1) |