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Earnings Per Share and Common Stock | 6 Months Ended
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Jun. 30, 2023
Earnings Per Share [Abstract] |
Earnings Per Share and Common Stock [Text Block] | EARNINGS PER SHARE AND COMMON STOCK We compute basic earnings per share using the weighted average number of shares of common stock outstanding during each period. The difference between basic and diluted earnings per share, if any, arises from non-vested restricted stock units and performance share awards granted under our Executive Long-Term Incentive Compensation Plan.
|  |  | 2023 |  |  |  |  |  | 2022 |  |
Reconciliation of Basic and Diluted |  |  | Dilutive |  |  |  |  |  | Dilutive |  |
Earnings Per Share | Basic |  | Securities |  | Diluted |  | Basic |  | Securities |  | Diluted
Millions Except Per Share Amounts |  |  |  |  |  |  |  |  |  |  |
Quarter ended June 30, |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to ALLETE | $51.5 |  |  |  |  | $51.5 |  |  | $37.6 |  |  |  |  | $37.6 |
Average Common Shares | 57.3 |  |  | 0.1 |  |  | 57.4 |  |  | 56.1 |  |  | — |  |  | 56.1 |
Earnings Per Share | $0.90 |  |  |  |  | $0.90 |  |  | $0.67 |  |  |  |  | $0.67 |
Six Months Ended June 30, |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to ALLETE | $109.7 |  |  |  |  | $109.7 |  |  | $103.9 |  |  |  |  | $103.9 |
Average Common Shares | 57.3 |  |  | 0.1 |  |  | 57.4 |  |  | 54.9 |  |  | — |  |  | 54.9 |
Earnings Per Share | $1.91 |  |  |  |  | $1.91 |  |  | $1.89 |  |  |  |  | $1.89 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-3 + Details
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