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EARNINGS PER SHARE AND COMMON STOCK (Tables) | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Schedule of Reconciliation of Basic and Diluted Earnings Per Share | 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.
|  |  | 2025 |  |  |  |  |  | 2024 |  |
Reconciliation of Basic and Diluted |  |  | Dilutive |  |  |  |  |  | Dilutive |  |
Earnings Per Share | Basic |  | Securities |  | Diluted |  | Basic |  | Securities |  | Diluted
Millions Except Per Share Amounts |  |  |  |  |  |  |  |  |  |  |
Quarter ended September 30, |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to ALLETE | $27.1 |  |  |  |  | $27.1 |  |  | $45.0 |  |  |  |  | $45.0 |
Average Common Shares | 58.1 |  |  | 0.1 |  |  | 58.2 |  |  | 57.8 |  |  | 0.1 |  |  | 57.9 |
Earnings Per Share | $0.47 |  |  |  |  | $0.46 |  |  | $0.78 |  |  |  |  | $0.78 |
Nine Months Ended September 30, |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to ALLETE | $115.1 |  |  |  |  | $115.1 |  |  | $128.7 |  |  |  |  | $128.7 |
Average Common Shares | 58.0 |  |  | 0.1 |  |  | 58.1 |  |  | 57.7 |  |  | 0.1 |  |  | 57.8 |
Earnings Per Share | $1.98 |  |  |  |  | $1.98 |  |  | $2.23 |  |  |  |  | $2.23 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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