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Regulatory Assets and Liabilities - Plant Retirements (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | May 31, 2021
--- | --- | --- | ---
Regulatory assets |  |  |
Total regulatory assets | $ 3,274.7 | $ 3,306.9 |
Deferred tax liabilities | 4,198.0 | 4,072.5 |
Securitization |  |  |
Regulatory assets |  |  |
Total regulatory assets | 85.9 | $ 92.4 |
Edgewater Unit 4 |  |  |
Regulatory assets |  |  |
Total regulatory assets | 2.1 |  |
Pleasant Prairie power plant |  |  |
Regulatory assets |  |  |
Net book value of retired plant | 542.4 |  |
Deferred unprotected tax benefits | 16.4 |  |
Total regulatory assets | 526.0 |  |
Deferred tax liabilities | 147.8 |  |
Pleasant Prairie power plant | Securitization |  |  |
Regulatory assets |  |  |
Total regulatory assets |  |  | $ 100.0
Presque Isle power plant |  |  |
Regulatory assets |  |  |
Net book value of retired plant | 152.9 |  |
Deferred unprotected tax benefits | 4.8 |  |
Total regulatory assets | 148.1 |  |
Deferred tax liabilities | 41.5 |  |
Pulliam power plant |  |  |
Regulatory assets |  |  |
Total regulatory assets | $ 33.0 |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
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