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Regulatory Assets and Liabilities - Regulatory Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Regulatory liabilities |  |
Other current liabilities | $ 45.3 | $ 47.5
Regulatory liabilities | 3,958.0 | 3,697.7
Total regulatory liabilities | 4,003.3 | 3,745.2
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,825.4 | 1,901.8
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,458.2 | 1,329.9
Pension and OPEB benefits |  |
Regulatory liabilities |  |
Total regulatory liabilities | 308.5 | 299.2
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 160.8 | 72.4
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 47.2 | 21.2
Revenue requirements of renewable generation facilities |  |
Regulatory liabilities |  |
Total regulatory liabilities | 44.2 | 0.0
Derivatives |  |
Regulatory liabilities |  |
Total regulatory liabilities | 36.9 | 19.2
Electric transmission costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 19.7 | 30.3
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 102.4 | $ 71.2

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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477571/980-405-25-1 + Details
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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477571/980-405-25-1 + Details
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