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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Regulatory liabilities |  |
Other current liabilities | $ 6.7 | $ 51.0
Regulatory liabilities | 4,131.2 | 3,928.1
Total regulatory liabilities | 4,137.9 | 3,979.1
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 2,030.1 | 2,137.7
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,244.5 | 1,221.1
Pension and OPEB benefits |  |
Regulatory liabilities |  |
Total regulatory liabilities | 366.3 | 378.1
Derivatives |  |
Regulatory liabilities |  |
Total regulatory liabilities | 298.7 | 16.4
Electric transmission costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 83.5 | 78.5
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 47.2 | 25.5
Earnings sharing mechanisms |  |
Regulatory liabilities |  |
Total regulatory liabilities | 25.2 | 36.9
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 5.5 | 59.9
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 36.9 | $ 25.0

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