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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Regulatory liabilities |  |
Amounts refundable to customers | $ 155.8 | $ 87.6
Regulatory liabilities | 3,987.1 | 3,992.8
Total regulatory liabilities | 4,142.9 | 4,080.4
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 2,222.9 | 2,248.8
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,195.0 | 1,181.5
Pension and OPEB benefits |  |
Regulatory liabilities |  |
Total regulatory liabilities | 349.5 | 354.9
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 162.2 | 89.8
Electric transmission costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 51.0 | 42.2
Earnings sharing mechanisms |  |
Regulatory liabilities |  |
Total regulatory liabilities | 40.6 | 43.5
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 39.0 | 39.1
Energy efficiency programs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 35.6 | 30.7
Decoupling |  |
Regulatory liabilities |  |
Total regulatory liabilities | 35.0 | 36.8
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 12.1 | $ 13.1

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