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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Regulatory liabilities |  |
Other current liabilities | $ 79.2 | $ 47.5
Regulatory liabilities | 3,730.2 | 3,697.7
Total regulatory liabilities | 3,809.4 | 3,745.2
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,862.6 | 1,901.8
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,365.4 | 1,329.9
Pension and OPEB benefits |  |
Regulatory liabilities |  |
Total regulatory liabilities | 300.0 | 299.2
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 119.3 | 72.4
Electric transmission costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 31.0 | 30.3
Energy efficiency programs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 20.6 | 17.2
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 19.0 | 21.2
Derivatives |  |
Regulatory liabilities |  |
Total regulatory liabilities | 15.2 | 19.2
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 76.3 | $ 54.0

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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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