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Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2024
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 (in millions):
|  | Amount Reclassified from AOCI |
| Location on the Consolidated Statements of Income | Three Months Ended March 31, |
|  | 2024 |  | 2023 |
Gains and (losses) on cash flow hedges: |  |  |  |  |
Interest rate swaps | Interest expense | $ | (0.7 | ) | $ | (0.7 | )
Commodity contracts | Fuel, purchased power and cost of natural gas sold |  | (2.6 | ) |  | (2.0 | )
|  | $ | (3.3 | ) | $ | (2.7 | )
Income tax | Income tax expense |  | 0.7 |  |  | 0.6 |
Total reclassification adjustments related to cash flow hedges, net of tax |  | $ | (2.6 | ) | $ | (2.1 | )
Total reclassifications |  | $ | (2.6 | ) | $ | (2.1 | )
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 (in millions):
| Derivatives Designated as Cash Flow Hedges |  |  |  |  |
| Interest Rate Swaps |  | Commodity Derivatives |  | Employee Benefit Plans |  | Total |
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 |  | 0.6 |  |  | 2.0 |  |  | - |  |  | 2.6 |
As of March 31, 2024 | $ | (5.5 | ) | $ | (0.6 | ) | $ | (6.2 | ) | $ | (12.3 | )
| Derivatives Designated as Cash Flow Hedges |  |  |  |  |
| Interest Rate Swaps |  | Commodity Derivatives |  | Employee Benefit Plans |  | Total |
As of December 31, 2022 | $ | (8.3 | ) | $ | (1.2 | ) | $ | (6.1 | ) | $ | (15.6 | )
Other comprehensive income (loss) |  |  |  |  |  |  |  |
before reclassifications |  | - |  |  | (0.9 | ) |  | - |  |  | (0.9 | )
Amounts reclassified from AOCI |  | 0.6 |  |  | 1.5 |  |  | - |  |  | 2.1 |
As of March 31, 2023 | $ | (7.7 | ) | $ | (0.6 | ) | $ | (6.1 | ) | $ | (14.4 | )

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