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Earnings Per Share and Common Stock
 3 Months Ended
Mar. 31, 2024
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 Months Ended March 31, 2024  2023 
Reconciliation of Basic and Diluted Dilutive  Dilutive 
Earnings Per ShareBasicSecuritiesDilutedBasicSecuritiesDiluted
Millions Except Per Share Amounts      
Net Income Attributable to ALLETE$50.7 $50.7 $58.2 $58.2 
Average Common Shares57.6 0.1 57.7 57.3 — 57.3 
Earnings Per Share$0.88 $0.88 $1.02 $1.02