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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Regulatory liabilities |  |
Other current liabilities | $ 61.0 | $ 45.3
Regulatory liabilities | 3,940.3 | 3,958.0
Total regulatory liabilities | 4,001.3 | 4,003.3
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,808.0 | 1,825.4
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,552.3 | 1,458.2
Pension and OPEB benefits |  |
Regulatory liabilities |  |
Total regulatory liabilities | 292.0 | 308.5
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 89.2 | 47.2
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 71.4 | 160.8
Derivatives |  |
Regulatory liabilities |  |
Total regulatory liabilities | 35.5 | 36.9
Revenue requirements of renewable generation facilities |  |
Regulatory liabilities |  |
Total regulatory liabilities | 21.5 | 44.2
MERC property tax tracker |  |
Regulatory liabilities |  |
Total regulatory liabilities | 21.0 | 19.3
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 110.4 | $ 102.8

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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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- 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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