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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Regulatory liabilities |  |
Other current liabilities | $ 96.8 | $ 14.3
Regulatory liabilities | 4,032.6 | 3,946.0
Total regulatory liabilities | 4,129.4 | 3,960.3
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,981.6 | 1,998.5
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,247.2 | 1,248.0
Pension and OPEB benefits |  |
Regulatory liabilities |  |
Total regulatory liabilities | 392.8 | 397.3
Derivatives |  |
Regulatory liabilities |  |
Total regulatory liabilities | 245.3 | 124.1
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 97.6 | 13.7
Electric transmission costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 65.5 | 84.2
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 29.7 | 37.1
Earnings sharing mechanisms |  |
Regulatory liabilities |  |
Total regulatory liabilities | 22.5 | 28.4
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 47.2 | $ 29.0

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