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Regulatory Assets and Liabilities - Plant Retirements (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2019
--- | --- | --- | ---
Regulatory assets |  |  |
Total regulatory assets | $ 3,306.9 | $ 3,367.1 |
Deferred tax liabilities | 4,072.5 | 3,909.0 |
Securitization |  |  |
Regulatory assets |  |  |
Total regulatory assets | 92.4 | $ 100.7 |
Edgewater Unit 4 |  |  |
Regulatory assets |  |  |
Total regulatory assets | 3.2 |  |
Pleasant Prairie power plant |  |  |
Regulatory assets |  |  |
Net book value of retired plant | 575.1 |  |
Deferred unprotected tax benefits | 17.5 |  |
Total regulatory assets | 557.6 |  |
Deferred tax liabilities | 156.7 |  |
Pleasant Prairie power plant | Securitization |  |  |
Regulatory assets |  |  |
Total regulatory assets |  |  | $ 100.0
Presque Isle power plant |  |  |
Regulatory assets |  |  |
Net book value of retired plant | 163.7 |  |
Deferred unprotected tax benefits | 5.2 |  |
Total regulatory assets | 158.5 |  |
Deferred tax liabilities | 44.4 |  |
Pulliam power plant |  |  |
Regulatory assets |  |  |
Total regulatory assets | $ 36.6 |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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