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INCOME TAX EXPENSE (Tables) | 6 Months Ended
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Jun. 30, 2025
Income Tax Disclosure [Abstract] |
Schedule of Income Tax Expense |
|  | Quarter Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Millions |  |  |  |  |  |  |  |
Current Income Tax Expense |  |  |  |  |  |  |  |
Federal (a) |  | $1.2 |  | $3.3 |  | $4.3 |  | $6.8
State |  | 1.4 |  | 3.2 |  | 6.1 |  | 6.6
Total Current Income Tax Expense |  | $2.6 |  | $6.5 |  | $10.4 |  | $13.4
Deferred Income Tax Expense (Benefit) |  |  |  |  |  |  |  |
Federal (b) |  | $(2.8) |  | $(5.0) |  | $(4.2) |  | $(10.0)
State |  | (0.2) |  |  | 0.1 |  |  | 1.1 |  |  | 2.5 |
Investment Tax Credit Amortization |  | (0.2) |  |  | (0.2) |  |  | (0.4) |  |  | (0.5) |
Total Deferred Income Tax Benefit |  | $(3.2) |  | $(5.1) |  | $(3.5) |  | $(8.0)
Total Income Tax Expense (Benefit) |  | $(0.6) |  | $1.4 |  | $6.9 |  | $5.4
(a)For the quarter and six months ended June 30, 2025 and 2024, the federal current tax expense is partially offset by tax credits. (b)For the quarter and six months ended June 30, 2025 and 2024, the federal deferred income tax benefit is primarily due to tax credits.
Schedule of Reconciliation of Taxes from Federal Statutory Rate to Total Income Tax Expense | In each quarter, the Company updates its estimate of the annual effective tax rate and if the estimated annual effective tax rate changes, the Company would make a cumulative adjustment in that quarter. NOTE 8. INCOME TAX EXPENSE(Continued)
| Quarter Ended | Six Months Ended
Reconciliation of Taxes from Federal Statutory | June 30, | June 30,
Rate to Total Income Tax Expense | 2025 |  | 2024 | 2025 |  | 2024
Millions |  |  |  |  |  |
Income Before Income Taxes | $ | 6.0 |  |  | $ | 21.1 |  | $ | 48.2 |  |  | $ | 62.1 |
Statutory Federal Income Tax Rate | 21 | % |  | 21 | % | 21 | % |  | 21 | %
Income Taxes Computed at Statutory Federal Rate | $ | 1.2 |  |  | $ | 4.4 |  | $ | 10.1 |  |  | $ | 13.0 |
Increase (Decrease) in Income Tax Due to: |  |  |  |  |  |
State Income Taxes – Net of Federal Income Tax Benefit | 0.9 |  |  | 2.5 |  | 5.7 |  |  | 7.1 |
Production Tax Credits (a) | (1.6) |  |  | (5.1) |  | (6.4) |  |  | (16.7) |
Investment Tax Credits (a) | (0.8) |  |  | (0.9) |  | (3.6) |  |  | (1.2) |
Regulatory Differences – Excess Deferred Tax | (1.9) |  |  | (2.2) |  | (4.5) |  |  | (5.7) |
Non-Controlling Interest in Subsidiaries | 4.9 |  |  | 2.4 |  | 8.9 |  |  | 5.2 |
AFUDC – Equity | (0.3) |  |  | (0.3) |  | (0.7) |  |  | (0.9) |
Nondeductible Portion of Transaction Costs | 0.5 |  |  | 3.3 |  | 0.8 |  |  | 3.3 |
Other | (3.5) |  |  | (2.7) |  | (3.4) |  |  | 1.3 |
Total Income Tax Expense | $ | (0.6) |  |  | $ | 1.4 |  | $ | 6.9 |  |  | $ | 5.4 |
(a)For the quarter and six months ended June 30, 2025 and 2024, the credits are presented net of any estimated discount on the sale of certain credits.

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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