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v3.25.3

Other Comprehensive Income: Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Interest expense | $ 50.6 |  |  | $ 50.6 |  |  | $ 152.2 | $ 144.8
Fuel, purchased power and cost of natural gas sold | 112.0 |  |  | 94.5 |  |  | 595.7 | 518.2
Income tax (expense) benefit | (4.0) |  |  | (2.9) |  |  | (26.5) | (23.6)
Operations and maintenance | 150.8 |  |  | 145.6 |  |  | 452.2 | 420.8
Net income | 25.9 | $ 28.8 | $ 136.4 | 26.4 | $ 24.7 | $ 131.6 | 191.1 | 182.6
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Net income | (0.6) |  |  | (0.6) |  |  | (2.1) | (4.3)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Income before income taxes | (0.8) |  |  | (0.8) |  |  | (2.6) | (5.4)
Income tax (expense) benefit | 0.2 |  |  | 0.2 |  |  | 0.6 | 1.2
Net income | (0.6) |  |  | (0.6) |  |  | (2.0) | (4.2)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swap |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Interest expense | (0.7) |  |  | (0.8) |  |  | (2.1) | (2.2)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Commodity Contract |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Fuel, purchased power and cost of natural gas sold | (0.1) |  |  | (0.0) |  |  | (0.5) | (3.2)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Operations and maintenance | 0.0 |  |  | 0.0 |  |  | (0.1) | (0.1)
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Net income | $ 0.0 |  |  | $ 0.0 |  |  | $ (0.1) | $ (0.1)

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