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REGULATORY ASSETS AND LIABILITIES (Tables) | 9 Months Ended
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Sep. 30, 2025
Regulatory Assets and Liabilities Disclosure [Abstract] |
Schedule of regulatory assets |
(in millions) |  | September 30, 2025 |  | December 31, 2024
Regulatory assets |  |  |  |
Plant retirement related items |  | $ | 783.8 |  |  | $ | 810.5 |
Pension and OPEB costs |  | 616.5 |  |  | 684.9 |
Environmental remediation costs |  | 522.7 |  |  | 570.1 |
Income tax related items |  | 482.5 |  |  | 438.5 |
AROs |  | 188.7 |  |  | 166.7 |
Uncollectible expense |  | 117.4 |  |  | 151.5 |
Decoupling |  | 101.8 |  |  | 110.0 |
System support resource |  | 95.3 |  |  | 102.9 |
Securitization |  | 69.6 |  |  | 76.5 |
Bluewater |  | 43.0 |  |  | 57.7 |
Derivatives |  | 38.7 |  |  | 38.2 |
Finance and operating leases |  | 31.2 |  |  | 22.0 |
Energy efficiency programs |  | 21.7 |  |  | 26.5 |
Electric transmission costs |  | 20.5 |  |  | 0.4 |
Other, net |  | 107.6 |  |  | 122.3 |
Total regulatory assets |  | $ | 3,241.0 |  |  | $ | 3,378.7 |
Balance sheet presentation |  |  |  |
Other current assets |  | $ | 23.6 |  |  | $ | 39.0 |
Regulatory assets |  | 3,217.4 |  |  | 3,339.7 |
Total regulatory assets |  | $ | 3,241.0 |  |  | $ | 3,378.7 |
Schedule of regulatory liabilities |
(in millions) |  | September 30, 2025 |  | December 31, 2024
Regulatory liabilities |  |  |  |
Income tax related items |  | $ | 1,808.0 |  |  | $ | 1,825.4 |
Removal costs |  | 1,552.3 |  |  | 1,458.2 |
Pension and OPEB benefits |  | 292.0 |  |  | 308.5 |
Uncollectible expense |  | 89.2 |  |  | 47.2 |
Energy costs refundable through rate adjustments |  | 71.4 |  |  | 160.8 |
Derivatives |  | 35.5 |  |  | 36.9 |
Revenue requirements of renewable generation facilities |  | 21.5 |  |  | 44.2 |
MERC property tax tracker (1) |  | 21.0 |  |  | 19.3 |
Other, net |  | 110.4 |  |  | 102.8 |
Total regulatory liabilities |  | $ | 4,001.3 |  |  | $ | 4,003.3 |
Balance sheet presentation |  |  |  |
Other current liabilities |  | $ | 61.0 |  |  | $ | 45.3 |
Regulatory liabilities |  | 3,940.3 |  |  | 3,958.0 |
Total regulatory liabilities |  | $ | 4,001.3 |  |  | $ | 4,003.3 |
(1)MERC defers as a regulatory asset or liability the difference between actual property tax expense and the amount included in rates until recovery or refund is authorized in a future rate proceeding.

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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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