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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Regulatory liabilities |  |
Other current liabilities | $ 49.4 | $ 36.8
Regulatory liabilities | 4,198.8 | 4,251.6
Total regulatory liabilities | 4,248.2 | 4,288.4
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 2,358.6 | 2,406.6
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,313.3 | 1,329.6
Pension and OPEB benefits |  |
Regulatory liabilities |  |
Total regulatory liabilities | 227.1 | 238.3
Mines deferral |  |
Regulatory liabilities |  |
Total regulatory liabilities | 132.1 | 120.8
Decoupling |  |
Regulatory liabilities |  |
Total regulatory liabilities | 46.9 | 30.5
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 45.2 | 39.6
Energy efficiency programs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 33.4 | 31.7
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 32.3 | 30.5
Earnings sharing mechanisms |  |
Regulatory liabilities |  |
Total regulatory liabilities | 28.5 | 30.0
Derivatives |  |
Regulatory liabilities |  |
Total regulatory liabilities | 18.6 | 16.4
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 12.2 | $ 14.4

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