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REGULATORY ASSETS AND LIABILITIES (Tables) | 9 Months Ended
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Sep. 30, 2021
Regulatory Assets and Liabilities Disclosure [Abstract] |
Schedule of regulatory assets |
(in millions) |  | September 30, 2021 |  | December 31, 2020
Regulatory assets |  |  |  |
Pension and OPEB costs |  | $ | 1,019.1 |  |  | $ | 1,101.6 |
Plant retirements |  | 726.5 |  |  | 740.8 |
Environmental remediation costs |  | 601.9 |  |  | 638.2 |
Income tax related items |  | 459.3 |  |  | 454.6 |
Asset retirement obligations |  | 208.9 |  |  | 181.3 |
SSR |  | 131.6 |  |  | 135.6 |
Energy costs recoverable through rate adjustments (1) |  | 125.9 |  |  | 1.1 |
Securitization (2) |  | 102.9 |  |  | 105.2 |
MERC extraordinary natural gas costs (3) |  | 64.7 |  |  | — |
Uncollectible expense |  | 55.7 |  |  | 82.0 |
Derivatives |  | 25.9 |  |  | 26.5 |
Other, net |  | 105.7 |  |  | 77.2 |
Total regulatory assets |  | $ | 3,628.1 |  |  | $ | 3,544.1 |
Balance sheet presentation |  |  |  |
Amounts recoverable from customers (1) |  | $ | 139.4 |  |  | $ | 20.0 |
Regulatory assets |  | 3,488.7 |  |  | 3,524.1 |
Total regulatory assets |  | $ | 3,628.1 |  |  | $ | 3,544.1 |
(1)The increase in these regulatory assets primarily relates to the high natural gas costs that were incurred as a result of the extreme winter weather conditions in February 2021. See Note 22, Regulatory Environment, for more information. (2)See Note 19, Variable Interest Entities, for more information. (3)This regulatory asset relates to the extraordinary natural gas costs MERC incurred during February 2021 that are being recovered over 27 months, beginning in September 2021. See Note 22, Regulatory Environment, for more information.
Schedule of regulatory liabilities |
(in millions) |  | September 30, 2021 |  | December 31, 2020
Regulatory liabilities |  |  |  |
Income tax related items |  | $ | 2,030.1 |  |  | $ | 2,137.7 |
Removal costs |  | 1,244.5 |  |  | 1,221.1 |
Pension and OPEB benefits |  | 366.3 |  |  | 378.1 |
Derivatives (1) |  | 298.7 |  |  | 16.4 |
Electric transmission costs |  | 83.5 |  |  | 78.5 |
Uncollectible expense |  | 47.2 |  |  | 25.5 |
Earnings sharing mechanisms |  | 25.2 |  |  | 36.9 |
Energy costs refundable through rate adjustments |  | 5.5 |  |  | 59.9 |
Other, net |  | 36.9 |  |  | 25.0 |
Total regulatory liabilities |  | $ | 4,137.9 |  |  | $ | 3,979.1 |
Balance sheet presentation |  |  |  |
Other current liabilities |  | $ | 6.7 |  |  | $ | 51.0 |
Regulatory liabilities |  | 4,131.2 |  |  | 3,928.1 |
Total regulatory liabilities |  | $ | 4,137.9 |  |  | $ | 3,979.1 |
(1) For most energy-related physical and financial contracts that qualify as derivatives, our regulators allow the effects of fair value accounting to be offset to regulatory assets and liabilities. See Note 13, Derivative Instruments, for more information.

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