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EARNINGS PER SHARE AND COMMON STOCK (Tables)
 9 Months Ended
Sep. 30, 2024
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.
 2024  2023 
Reconciliation of Basic and Diluted Dilutive  Dilutive 
Earnings Per ShareBasicSecuritiesDilutedBasicSecuritiesDiluted
Millions Except Per Share Amounts      
Quarter ended September 30,      
Net Income Attributable to ALLETE$45.0 $45.0 $85.9 $85.9 
Average Common Shares57.8 0.1 57.9 57.4 0.1 57.5 
Earnings Per Share$0.78 $0.78 $1.50 $1.49 
Nine Months Ended September 30,
Net Income Attributable to ALLETE$128.7 $128.7 $195.6 $195.6 
Average Common Shares57.7 0.1 57.8 57.3 0.1 57.4 
Earnings Per Share$2.23 $2.23 $3.41 $3.41