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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Regulatory liabilities |  |
Current liabilities | $ 86.8 | $ 36.8
Regulatory liabilities | 4,243.6 | 4,251.6
Total regulatory liabilities | 4,330.4 | 4,288.4
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 2,389.6 | 2,406.6
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,304.7 | 1,329.6
Pension and OPEB costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 231.2 | 238.3
Mines deferral |  |
Regulatory liabilities |  |
Total regulatory liabilities | 130.5 | 120.8
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 90.1 | 39.6
Decoupling |  |
Regulatory liabilities |  |
Total regulatory liabilities | 48.7 | 30.5
Energy efficiency programs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 42.0 | 31.7
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 31.9 | 30.5
Earnings sharing mechanisms |  |
Regulatory liabilities |  |
Total regulatory liabilities | 30.0 | 30.0
Derivatives |  |
Regulatory liabilities |  |
Total regulatory liabilities | 17.5 | 16.4
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 14.2 | $ 14.4

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