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REGULATORY ASSETS AND LIABILITIES (Tables) | 3 Months Ended
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Mar. 31, 2021
Regulatory Assets and Liabilities Disclosure [Abstract] |
Schedule of regulatory assets |
(in millions) |  | March 31, 2021 |  | December 31, 2020
Regulatory assets |  |  |  |
Pension and OPEB costs |  | $ | 1,073.9 |  |  | $ | 1,101.6 |
Plant retirements |  | 733.1 |  |  | 740.8 |
Environmental remediation costs |  | 623.1 |  |  | 638.2 |
Income tax related items |  | 459.3 |  |  | 454.6 |
Energy costs recoverable through rate adjustments (1) |  | 301.6 |  |  | 1.1 |
Asset retirement obligations |  | 186.0 |  |  | 181.3 |
SSR |  | 134.6 |  |  | 135.6 |
Securitization |  | 106.9 |  |  | 105.2 |
Uncollectible expense |  | 73.0 |  |  | 82.0 |
Derivatives |  | 9.6 |  |  | 26.5 |
Other, net |  | 92.7 |  |  | 77.2 |
Total regulatory assets |  | $ | 3,793.8 |  |  | $ | 3,544.1 |
Balance sheet presentation |  |  |  |
Amounts recoverable from customers (1) |  | $ | 306.7 |  |  | $ | 20.0 |
Regulatory assets |  | 3,487.1 |  |  | 3,524.1 |
Total regulatory assets |  | $ | 3,793.8 |  |  | $ | 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.
Schedule of regulatory liabilities |
(in millions) |  | March 31, 2021 |  | December 31, 2020
Regulatory liabilities |  |  |  |
Income tax related items |  | $ | 2,111.0 |  |  | $ | 2,137.7 |
Removal costs |  | 1,234.6 |  |  | 1,221.1 |
Pension and OPEB benefits |  | 373.1 |  |  | 378.1 |
Electric transmission costs |  | 75.9 |  |  | 78.5 |
Earnings sharing mechanisms |  | 30.8 |  |  | 36.9 |
Energy costs refundable through rate adjustments |  | 24.7 |  |  | 59.9 |
Derivatives |  | 17.4 |  |  | 16.4 |
Energy efficiency programs |  | 11.0 |  |  | 9.9 |
Uncollectible expense |  | 3.2 |  |  | 25.5 |
Other, net |  | 21.6 |  |  | 15.1 |
Total regulatory liabilities |  | $ | 3,903.3 |  |  | $ | 3,979.1 |
Balance sheet presentation |  |  |  |
Other current liabilities |  | $ | 12.5 |  |  | $ | 51.0 |
Regulatory liabilities |  | 3,890.8 |  |  | 3,928.1 |
Total regulatory liabilities |  | $ | 3,903.3 |  |  | $ | 3,979.1 |

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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 + Details
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- Definition Tabular disclosure of regulatory liabilities. Detailed information about liabilities that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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