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Regulatory Assets and Liabilities - Plant Retirements (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | May 31, 2021
--- | --- | --- | ---
Regulatory assets |  |  |
Total regulatory assets | $ 3,378.7 | $ 3,274.7 |
Regulatory liability | 4,003.3 | 3,745.2 |
Deferred tax liabilities | 4,545.2 | 4,198.0 |
Securitization |  |  |
Regulatory assets |  |  |
Total regulatory assets | 76.5 | $ 85.9 |
Edgewater Generating Station unit 4 |  |  |
Regulatory assets |  |  |
Total regulatory assets | 1.0 |  |
Oak Creek power plant units 5 and 6 |  |  |
Regulatory assets |  |  |
Total regulatory assets | 75.3 |  |
Regulatory liability | 43.8 |  |
Deferred tax liabilities | 8.6 |  |
Pleasant Prairie power plant |  |  |
Regulatory assets |  |  |
Net book value of retired plant | 506.8 |  |
Deferred unprotected tax benefits | 15.4 |  |
Total regulatory assets | 491.4 |  |
Deferred tax liabilities | 138.0 |  |
Pleasant Prairie power plant | Securitization |  |  |
Regulatory assets |  |  |
Total regulatory assets |  |  | $ 100.0
Presque Isle power plant |  |  |
Regulatory assets |  |  |
Net book value of retired plant | 142.6 |  |
Deferred unprotected tax benefits | 4.4 |  |
Total regulatory assets | 138.2 |  |
Deferred tax liabilities | 38.7 |  |
Pulliam power plant |  |  |
Regulatory assets |  |  |
Total regulatory assets | $ 29.3 |  |

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