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Regulatory Assets and Liabilities - Regulatory Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Regulatory liabilities |  |
Other current liabilities | $ 47.5 | $ 56.4
Regulatory liabilities | 3,697.7 | 3,735.5
Total regulatory liabilities | 3,745.2 | 3,791.9
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,901.8 | 1,956.6
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,329.9 | 1,260.9
Pension and OPEB benefits |  |
Regulatory liabilities |  |
Total regulatory liabilities | 299.2 | 340.5
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 72.4 | 53.4
Electric transmission costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 30.3 | 0.4
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 21.2 | 24.0
Derivatives |  |
Regulatory liabilities |  |
Total regulatory liabilities | 19.2 | 76.7
Energy efficiency programs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 17.2 | 10.4
Decoupling |  |
Regulatory liabilities |  |
Total regulatory liabilities | 0.0 | 20.2
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 54.0 | $ 48.8

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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//1943274/2147481854/980-405-25-1 + 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//1943274/2147481854/980-405-25-1 + Details
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