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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
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Regulatory liabilities |  |
Other current liabilities | $ 95.9 | $ 88.9
Regulatory liabilities | 4,229.6 | 4,121.3
Total regulatory liabilities | 4,325.5 | 4,210.2
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,776.9 | 1,802.4
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,660.8 | 1,584.7
Pension and OPEB benefits |  |
Regulatory liabilities |  |
Total regulatory liabilities | 298.0 | 301.5
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 152.6 | 119.2
Settlement related to QIP and UEA riders |  |
Regulatory liabilities |  |
Total regulatory liabilities | 125.0 | 125.0
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 79.9 | 73.1
Derivatives |  |
Regulatory liabilities |  |
Total regulatory liabilities | 49.3 | 27.4
Earnings sharing mechanisms |  |
Regulatory liabilities |  |
Total regulatory liabilities | 34.0 | 35.8
MERC property tax tracker |  |
Regulatory liabilities |  |
Total regulatory liabilities | 24.9 | 23.1
Energy efficiency programs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 16.8 | 12.2
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 107.3 | $ 105.8

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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/1943274/2147477571/980-405-25-1 + Details
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