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v3.22.0.1

Consolidated Statement of Equity - USD ($) $ in Millions | Total | Common Stock [Member] | Accumulated Other Comprehensive Loss [Member] | Retained Earnings [Member] | Non-Controlling Interest in Subsidiaries [Member]
--- | --- | --- | --- | --- | ---
Balance, Beginning of Period at Dec. 31, 2018 |  | $ 1,428.5 | $ (27.3) | $ 754.6 | $ 0.0
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 8.2 |  |  |
Unrealized Gain (Loss) on Debt Securities | $ 0.2 |  | 0.2 |  |
Defined Benefit Pension and Other Postretirement Plans | 3.5 |  | 3.5 |  |
Net Loss Attributable to Non-Controlling Interest | (0.1) |  |  |  | (0.1)
Reclassification of Redeemable Non-Controlling Interest to Current Liabilities |  |  |  |  | 0.0
Distributions to Non-Controlling Interest |  |  |  |  | 0.0
Net Income Attributable to ALLETE | 185.6 |  |  | 185.6 |
Common Stock Dividends | 121.4 |  |  | (121.4) |
Adjustment of Redeemable Non-Controlling Interest |  |  |  | 0.0 |
Proceeds from Non-Controlling Interest - Net of Issuance Costs | 103.8 |  |  |  | 103.8
Balance, Ending of Period at Dec. 31, 2019 | $ 2,335.6 | 1,436.7 | (23.6) | 818.8 | 103.7
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Dividends Per Share of Common Stock | $ 2.35 |  |  |  |
Common Stock Issued |  | 24.2 |  |  |
Unrealized Gain (Loss) on Debt Securities | $ 0.1 |  | 0.1 |  |
Defined Benefit Pension and Other Postretirement Plans | (7.6) |  | (7.6) |  |
Net Loss Attributable to Non-Controlling Interest | (12.6) |  |  |  | (12.6)
Reclassification of Redeemable Non-Controlling Interest to Current Liabilities |  |  |  |  | 0.0
Distributions to Non-Controlling Interest |  |  |  |  | 0.0
Net Income Attributable to ALLETE | 174.2 |  |  | 174.2 |
Common Stock Dividends | 128.2 |  |  | (128.2) |
Adjustment of Redeemable Non-Controlling Interest |  |  |  | 0.0 |
Proceeds from Non-Controlling Interest - Net of Issuance Costs | 414.5 |  |  |  | 414.5
Balance, Ending of Period at Dec. 31, 2020 | $ 2,800.2 | 1,460.9 | (31.1) | 864.8 | 505.6
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Dividends Per Share of Common Stock | $ 2.47 |  |  |  |
Common Stock Issued |  | 75.8 |  |  |
Unrealized Gain (Loss) on Debt Securities | $ (0.1) |  | (0.1) |  |
Defined Benefit Pension and Other Postretirement Plans | 7.4 |  | 7.4 |  |
Net Loss Attributable to Non-Controlling Interest | (31.4) |  |  |  | (31.4)
Reclassification of Redeemable Non-Controlling Interest to Current Liabilities |  |  |  |  | (28.8)
Distributions to Non-Controlling Interest |  |  |  |  | (3.1)
Net Income Attributable to ALLETE | 169.2 |  |  | 169.2 |
Common Stock Dividends | 131.9 |  |  | (131.9) |
Adjustment of Redeemable Non-Controlling Interest |  |  |  | (1.9) |
Proceeds from Non-Controlling Interest - Net of Issuance Costs | 90.9 |  |  |  | 90.9
Balance, Ending of Period at Dec. 31, 2021 | $ 2,946.3 | $ 1,536.7 | $ (23.8) | $ 900.2 | $ 533.2
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Dividends Per Share of Common Stock | $ 2.52 |  |  |  |

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http://asc.fasb.org/extlink&oid=124434974&loc=SL124442142-165695 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4568740-111683 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 65 -Paragraph 1 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 45 -Paragraph 5 -Subparagraph (b) -URI 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-URI http://asc.fasb.org/extlink&oid=123459177&loc=SL121830611-158277 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 65 -Paragraph 8 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=123459177&loc=SL121830611-158277 Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (f)(2) -URI 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(a)(3)(iii)(03) + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant