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REGULATORY ASSETS AND LIABILITIES (Tables) | 6 Months Ended
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Jun. 30, 2026
Regulatory Assets and Liabilities Disclosure [Abstract] |
Schedule of regulatory assets |
(in millions) |  | June 30, 2026 |  | December 31, 2025
Regulatory assets |  |  |  |
Plant retirement related items |  | $ | 736.6 |  |  | $ | 768.6 |
Environmental remediation costs |  | 545.6 |  |  | 566.0 |
Income tax related items |  | 531.4 |  |  | 493.4 |
Pension and OPEB costs |  | 524.9 |  |  | 564.5 |
AROs |  | 205.5 |  |  | 185.1 |
System support resource |  | 87.5 |  |  | 92.6 |
Decoupling |  | 81.0 |  |  | 43.8 |
Electric transmission costs |  | 73.8 |  |  | 30.7 |
Uncollectible expense |  | 71.1 |  |  | 123.9 |
Securitization |  | 63.6 |  |  | 67.5 |
Derivatives |  | 48.7 |  |  | 57.7 |
Finance and operating leases |  | 44.5 |  |  | 36.0 |
Bluewater |  | 28.6 |  |  | 37.7 |
Energy costs recoverable through rate adjustments |  | 24.3 |  |  | 6.7 |
Other, net |  | 102.0 |  |  | 99.4 |
Total regulatory assets |  | $ | 3,169.1 |  |  | $ | 3,173.6 |
Balance sheet presentation |  |  |  |
Other current assets |  | $ | 38.7 |  |  | $ | 17.3 |
Regulatory assets |  | 3,130.4 |  |  | 3,156.3 |
Total regulatory assets |  | $ | 3,169.1 |  |  | $ | 3,173.6 |
Schedule of regulatory liabilities |
(in millions) |  | June 30, 2026 |  | December 31, 2025
Regulatory liabilities |  |  |  |
Income tax related items |  | $ | 1,776.9 |  |  | $ | 1,802.4 |
Removal costs |  | 1,660.8 |  |  | 1,584.7 |
Pension and OPEB benefits |  | 298.0 |  |  | 301.5 |
Energy costs refundable through rate adjustments |  | 152.6 |  |  | 119.2 |
Settlement related to QIP and UEA riders |  | 125.0 |  |  | 125.0 |
Uncollectible expense |  | 79.9 |  |  | 73.1 |
Derivatives |  | 49.3 |  |  | 27.4 |
Earnings sharing mechanisms |  | 34.0 |  |  | 35.8 |
MERC property tax tracker |  | 24.9 |  |  | 23.1 |
Energy efficiency programs |  | 16.8 |  |  | 12.2 |
Other, net |  | 107.3 |  |  | 105.8 |
Total regulatory liabilities |  | $ | 4,325.5 |  |  | $ | 4,210.2 |
Balance sheet presentation |  |  |  |
Other current liabilities |  | $ | 95.9 |  |  | $ | 88.9 |
Regulatory liabilities |  | 4,229.6 |  |  | 4,121.3 |
Total regulatory liabilities |  | $ | 4,325.5 |  |  | $ | 4,210.2 |

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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 -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478574/980-715-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-2 + 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 -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477571/980-405-25-1 + Details
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