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Income Tax Expense | 9 Months Ended
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Sep. 30, 2021
Income Tax Disclosure [Abstract] |
Income Tax Expense [Text Block] | INCOME TAX EXPENSE
|  | Quarter Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Millions |  |  |  |  |  |  |  |
Current Income Tax Expense (a) |  |  |  |  |  |  |  |
Federal |  | — |  |  | — |  |  | — |  |  | — |
State |  | $0.1 |  |  | $0.1 |  |  | $0.1 |  |  | $0.1 |
Total Current Income Tax Expense |  | $0.1 |  |  | $0.1 |  |  | $0.1 |  |  | $0.1 |
Deferred Income Tax Expense (Benefit) |  |  |  |  |  |  |  |
Federal (b) |  | $(5.8) |  | $(8.3) |  | $(26.3) |  | $(34.5)
State |  | 0.9 |  | 2.9 |  | 7.3 |  | 7.1
Investment Tax Credit Amortization |  | (0.1) |  | (0.2) |  | (0.4) |  | (0.5)
Total Deferred Income Tax Benefit |  | $(5.0) |  | $(5.6) |  | $(19.4) |  | $(27.9)
Total Income Tax Benefit |  | $(4.9) |  | $(5.5) |  | $(19.3) |  | $(27.8)
(a)For each of the three and nine months ended September 30, 2021 and 2020, the federal and state current tax expense was minimal due to NOLs which resulted from the bonus depreciation provisions of certain tax legislation. Federal and state NOLs are being carried forward to offset current and future taxable income. (b)For each of the three and nine months ended September 30, 2021 and 2020, the federal income tax benefit is primarily due to production tax credits. The Company's tax provision for interim periods is determined using an estimate of its annual effective tax rate, adjusted for discrete items arising in that quarter. 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.
| Quarter Ended | Nine Months Ended
Reconciliation of Taxes from Federal Statutory | September 30, | September 30,
Rate to Total Income Tax Expense | 2021 |  | 2020 | 2021 |  | 2020
Millions |  |  |  |  |  |
Income Before Income Taxes | $19.2 |  |  | $33.3 |  | $69.9 |  |  | $92.4 |
Statutory Federal Income Tax Rate | 21 | % |  | 21 | % | 21 | % |  | 21 | %
Income Taxes Computed at Statutory Federal Rate | $4.0 |  |  | $7.0 |  | $14.7 |  |  | $19.4 |
Increase (Decrease) in Income Tax Due to: |  |  |  |  |  |
State Income Taxes (Credit) – Net of Federal Income Tax Benefit | 0.7 |  |  | 2.4 |  | 5.8 |  |  | 5.7 |
Production Tax Credits | (9.5) |  |  | (12.5) |  | (36.6) |  |  | (45.9) |
Regulatory Differences – Excess Deferred Tax | (2.1) |  |  | (3.2) |  | (6.7) |  |  | (8.5) |
Non-Controlling Interest in Subsidiaries | 0.8 |  |  | 0.4 |  | 3.9 |  |  | 1.5 |
Share-Based Compensation | — |  |  | — |  | 0.5 |  |  | (0.1) |
Other | 1.2 |  |  | 0.4 |  | (0.9) |  |  | 0.1 |
Total Income Tax Benefit | $(4.9) |  | $(5.5) | $(19.3) |  | $(27.8)
For the nine months ended September 30, 2021, the effective tax rate was a benefit of 27.6 percent (benefit of 30.1 percent for the nine months ended September 30, 2020). The effective tax rate for 2021 and 2020 was primarily impacted by production tax credits. Uncertain Tax Positions. As of September 30, 2021, we had gross unrecognized tax benefits of $1.5 million ($1.4 million as of December 31, 2020). Of the total gross unrecognized tax benefits, $0.6 million represents the amount of unrecognized tax benefits included on the Consolidated Balance Sheet that, if recognized, would favorably impact the effective income tax rate. The unrecognized tax benefit amounts have been presented as reductions to the tax benefits associated with NOL and tax credit carryforwards on the Consolidated Balance Sheet. ALLETE and its subsidiaries file a consolidated federal income tax return as well as combined and separate state income tax returns in various jurisdictions. ALLETE has no open federal or state audits, and is no longer subject to federal examination for years before 2017, or state examination for years before 2016.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32857-109319 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 17 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32809-109319 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.5.Q1) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32705-109319 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 270 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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