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REGULATORY ASSETS AND LIABILITIES | 9 Months Ended
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Sep. 30, 2021
Regulatory Assets and Liabilities Disclosure [Abstract] |
REGULATORY ASSETS AND LIABILITIES | REGULATORY ASSETS AND LIABILITIES The following regulatory assets and liabilities were reflected on our balance sheets at September 30, 2021 and December 31, 2020. For more information on our regulatory assets and liabilities, see Note 6, Regulatory Assets and Liabilities, in our 2020 Annual Report on Form 10-K.
(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.
(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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- Definition The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit. + References No definition available. + Details
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