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EARNINGS PER SHARE AND COMMON STOCK | 3 Months Ended
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Mar. 31, 2025
Earnings Per Share [Abstract] |
EARNINGS PER SHARE AND COMMON STOCK | 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.
Three Month Ended March 31, |  |  | 2025 |  |  |  |  |  | 2024 |  |
Reconciliation of Basic and Diluted |  |  | Dilutive |  |  |  |  |  | Dilutive |  |
Earnings Per Share | Basic |  | Securities |  | Diluted |  | Basic |  | Securities |  | Diluted
Millions Except Per Share Amounts |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to ALLETE | $56.1 |  |  |  |  | $56.1 |  |  | $50.7 |  |  |  |  | $50.7 |
Average Common Shares | 57.9 |  |  | 0.1 |  |  | 58.0 |  |  | 57.6 |  |  | 0.1 |  |  | 57.7 |
Earnings Per Share | $0.97 |  |  |  |  | $0.97 |  |  | $0.88 |  |  |  |  | $0.88 |

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