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Income Tax Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Current Income Tax Expense (Benefit) [Abstract] |  |  |  |  |  |  |  |
Federal | [1] | $ 3.0 |  | $ 0.0 | $ 8.6 |  | $ 0.0 |
State | [1] | 3.2 |  | 0.0 | 5.4 |  | 0.1 |
Total Current Income Tax Expense |  | 6.2 |  | 0.0 | 14.0 |  | 0.1 |
Deferred Income Tax Expense (Benefit) [Abstract] |  |  |  |  |  |  |  |
Federal | [2] | (7.8) |  | (3.7) | (16.1) |  | (12.3) |
State |  | 1.3 |  | (4.5) | 3.4 |  | 0.3 |
Investment Tax Credit Amortization |  | (0.1) |  | (0.1) | (0.2) |  | (0.3) |
Total Deferred Income Tax Expense (Benefit) |  | (6.6) |  | (8.3) | (12.9) |  | (12.3) |
Total Income Tax Expense (Benefit) |  | (0.4) |  | (8.3) | 1.1 |  | (12.2) |
Reconciliation of Taxes from Federal Statutory Rate to Total Income Tax Expense [Abstract] |  |  |  |  |  |  |  |
Income Before Income Taxes |  | $ 40.3 |  | $ 12.5 | $ 79.4 |  | $ 55.1 |
Statutory Federal Income Tax Rate |  | 21.00% |  | 21.00% | 21.00% |  | 21.00% |
Income Taxes Computed at Statutory Federal Rate |  | $ 8.5 |  | $ 2.6 | $ 16.7 |  | $ 11.6 |
Increase (Decrease) in Income Tax Due to: [Abstract] |  |  |  |  |  |  |  |
State Income Taxes – Net of Federal Income Tax Benefit |  | 3.6 |  | 1.6 | 7.0 |  | 5.5 |
Deferred Revaluation – Net of Federal Income Tax Benefit |  | 0.0 |  | (5.2) | 0.0 |  | (5.2) |
Production Tax Credits |  | (10.2) | [3] | (7.1) | (20.6) | [3] | (24.7) |
Effective Income Tax Rate Reconciliation, Investment Tax Credits |  | (1.4) | [3] | 0.0 | (3.6) | [3] | 0.0 |
Regulatory Differences – Excess Deferred Tax |  | (2.4) |  | (1.4) | (5.2) |  | (5.2) |
Non-Controlling Interest in Subsidiaries |  | 2.1 |  | 3.2 | 5.9 |  | 7.0 |
Other |  | (0.6) |  | (2.0) | 0.9 |  | (1.2) |
Total Income Tax Expense (Benefit) |  | (0.4) |  | $ (8.3) | $ 1.1 |  | $ (12.2) |
Effective Tax Rate |  |  |  |  | 1.40% |  | (22.10%) |
Uncertain Tax Positions [Abstract] |  |  |  |  |  |  |  |
Gross Unrecognized Tax Benefits |  | 1.1 |  |  | $ 1.1 |  |  | $ 1.3
Gross Unrecognized Tax Benefits That Would Favorably Impact Effective Income Tax Rate |  | $ 0.6 |  |  | $ 0.6 |  |  |
[1] | For the quarter and six months ended June 30, 2022, the federal and state current tax expense was minimal due to NOLs which resulted from the bonus depreciation provisions of certain tax legislation. For the quarter and six months ended June 30, 2023, the federal current tax expense was partially offset by production tax credits.
[2] | For the quarter and six months ended June 30, 2023 and 2022, the federal income tax benefit is primarily due to production tax credits.
[3] | For the quarter and six months ended June 30, 2023, the credits are presented net of any estimated discount on the sale of certain credits.

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other tax credits. + References Reference 1: 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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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482525/740-10-45-10B + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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