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Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2025
Statement of Comprehensive Income [Abstract] |
Reclassification out of Accumulated Other Comprehensive Income | The following table details reclassifications out of AOCI and into Net income. The amounts in parentheses below indicate decreases to Net income in the Consolidated Statements of Income for the period, net of tax:
|  | Amount Reclassified from AOCI |
|  | Three Months Ended September 30, |  | Nine Months Ended September 30, |
| Location on the Consolidated Statements of Income | 2025 |  | 2024 |  | 2025 |  | 2024 |
|  | (in millions) |
Gains and (losses) on cash flow hedges: |  |  |  |  |  |  |  |  |
Interest rate swaps | Interest expense | $ | (0.7 | ) | $ | (0.8 | ) | $ | (2.1 | ) | $ | (2.2 | )
Commodity contracts | Fuel, purchased power, and cost of natural gas sold |  | (0.1 | ) |  | — |  |  | (0.5 | ) |  | (3.2 | )
|  | $ | (0.8 | ) | $ | (0.8 | ) | $ | (2.6 | ) | $ | (5.4 | )
Income tax | Income tax (expense) benefit |  | 0.2 |  |  | 0.2 |  |  | 0.6 |  |  | 1.2 |
Total reclassification adjustments related to cash flow hedges, net of tax |  | $ | (0.6 | ) | $ | (0.6 | ) | $ | (2.0 | ) | $ | (4.2 | )
Amortization of components of defined benefit plans: |  |  |  |  |  |  |  |  |
Actuarial (loss) | Operations and maintenance |  | — |  |  | — |  |  | (0.1 | ) |  | (0.1 | )
Total reclassification adjustments related to defined benefit plans, net of tax |  | $ | — |  | $ | — |  | $ | (0.1 | ) | $ | (0.1 | )
Total reclassifications |  | $ | (0.6 | ) | $ | (0.6 | ) | $ | (2.1 | ) | $ | (4.3 | )
Schedule of Accumulated Other Comprehensive Income (Loss) | Balances by classification included within AOCI, net of tax on the accompanying Consolidated Balance Sheets were as follows:
| Derivatives Designated as Cash Flow Hedges |  |  |  |  |
| Interest Rate Swaps |  | Commodity Derivatives |  | Employee Benefit Plans |  | Total |
| (in millions) |
As of December 31, 2024 | $ | (3.8 | ) | $ | (0.3 | ) | $ | (5.3 | ) | $ | (9.4 | )
Other comprehensive income (loss) before reclassifications |  | — |  |  | (1.5 | ) |  | — |  |  | (1.5 | )
Amounts reclassified from AOCI |  | 1.6 |  |  | 0.4 |  |  | 0.1 |  |  | 2.1 |
As of September 30, 2025 | $ | (2.2 | ) | $ | (1.4 | ) | $ | (5.2 | ) | $ | (8.8 | )
| Derivatives Designated as Cash Flow Hedges |  |  |  |  |
| Interest Rate Swaps |  | Commodity Derivatives |  | Employee Benefit Plans |  | Total |
| (in millions) |
As of December 31, 2023 | $ | (6.1 | ) | $ | (2.5 | ) | $ | (6.2 | ) | $ | (14.8 | )
Other comprehensive income (loss) before reclassifications |  | — |  |  | (0.1 | ) |  | — |  |  | (0.1 | )
Amounts reclassified from AOCI |  | 1.7 |  |  | 2.5 |  |  | 0.1 |  |  | 4.3 |
As of September 30, 2024 | $ | (4.4 | ) | $ | (0.1 | ) | $ | (6.1 | ) | $ | (10.6 | )

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