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REGULATORY ASSETS AND LIABILITIES (Tables) | 3 Months Ended
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Mar. 31, 2019
Regulatory Assets and Liabilities Disclosure [Abstract] |
Schedule of regulatory assets |
(in millions) |  | March 31, 2019 |  | December 31, 2018
Regulatory assets |  |  |  |
Pension and OPEB costs |  | $ | 1,173.8 |  |  | $ | 1,193.5 |
Plant retirements * |  | 1,027.9 |  |  | 832.3 |
Environmental remediation costs |  | 697.6 |  |  | 687.1 |
Income tax related items |  | 384.8 |  |  | 369.1 |
SSR |  | 317.9 |  |  | 316.7 |
Asset retirement obligations |  | 223.4 |  |  | 185.4 |
Uncollectible expense |  | 47.6 |  |  | 38.7 |
Electric transmission costs |  | 41.7 |  |  | 58.1 |
We Power generation |  | 36.1 |  |  | 43.0 |
Energy efficiency programs |  | 11.3 |  |  | 14.0 |
Other, net |  | 75.0 |  |  | 117.9 |
Total regulatory assets |  | $ | 4,037.1 |  |  | $ | 3,855.8 |
Balance sheet presentation |  |  |  |
Other current assets |  | $ | 27.3 |  |  | $ | 50.7 |
Regulatory assets |  | 4,009.8 |  |  | 3,805.1 |
Total regulatory assets |  | $ | 4,037.1 |  |  | $ | 3,855.8 |
* | On March 31, 2019, the PIPP generating units were retired by WE. See Note 5, Property, Plant, and Equipment, for more information on the retirement of the PIPP units.
Schedule of regulatory liabilities |
(in millions) |  | March 31, 2019 |  | December 31, 2018
Regulatory liabilities |  |  |  |
Income tax related items |  | $ | 2,401.2 |  |  | $ | 2,406.6 |
Removal costs |  | 1,330.8 |  |  | 1,329.6 |
Pension and OPEB costs |  | 235.7 |  |  | 238.3 |
Mines deferral |  | 129.1 |  |  | 120.8 |
Energy costs refundable through rate adjustments |  | 103.0 |  |  | 39.6 |
Decoupling |  | 51.0 |  |  | 30.5 |
Energy efficiency programs |  | 45.7 |  |  | 31.7 |
Earnings sharing mechanisms |  | 29.9 |  |  | 30.0 |
Uncollectible expense |  | 29.5 |  |  | 30.5 |
Derivatives |  | 9.0 |  |  | 16.4 |
Other, net |  | 13.3 |  |  | 14.4 |
Total regulatory liabilities |  | $ | 4,378.2 |  |  | $ | 4,288.4 |
Balance sheet presentation |  |  |  |
Other current liabilities |  | $ | 103.9 |  |  | $ | 36.8 |
Regulatory liabilities |  | 4,274.3 |  |  | 4,251.6 |
Total regulatory liabilities |  | $ | 4,378.2 |  |  | $ | 4,288.4 |

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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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