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EARNINGS PER SHARE AND COMMON STOCK (Tables)
 6 Months Ended
Jun. 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 ShareBasicSecuritiesDilutedBasicSecuritiesDiluted
Millions Except Per Share Amounts      
Quarter ended June 30,       
Net Income Attributable to ALLETE$31.9 $31.9 $33.0 $33.0 
Average Common Shares58.0 0.1 58.1 57.7 0.1 57.8 
Earnings Per Share$0.55 $0.55 $0.57 $0.57 
Six Months Ended June 30,
Net Income Attributable to ALLETE$88.0 $88.0 $83.7 $83.7 
Average Common Shares58.0 — 58.0 57.7 — 57.7 
Earnings Per Share$1.52 $1.52 $1.45 $1.45