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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Regulatory liabilities |  |
Other current liabilities | $ 47.9 | $ 14.3
Regulatory liabilities | 3,947.0 | 3,946.0
Total regulatory liabilities | 3,994.9 | 3,960.3
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,959.0 | 1,998.5
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,255.5 | 1,248.0
Pension and OPEB benefits |  |
Regulatory liabilities |  |
Total regulatory liabilities | 384.0 | 397.3
Derivatives |  |
Regulatory liabilities |  |
Total regulatory liabilities | 241.3 | 124.1
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 45.3 | 13.7
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 30.6 | 37.1
Electric transmission costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 15.9 | 84.2
Earnings sharing mechanisms |  |
Regulatory liabilities |  |
Total regulatory liabilities | 10.1 | 28.4
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 53.2 | $ 29.0

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