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Earnings Per Share
3 Months Ended
Mar. 31, 2022
Earnings Per Share [Abstract]  
Earnings Per Share and Common Stock [Text Block] 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.
  2022  2021 
Reconciliation of Basic and Diluted Dilutive  Dilutive 
Earnings Per ShareBasicSecuritiesDilutedBasicSecuritiesDiluted
Millions Except Per Share Amounts      
Three Months Ended March 31,    
Net Income Attributable to ALLETE$66.3 $66.3 $51.8 $51.8 
Average Common Shares53.3 — 53.3 52.1 0.1 52.2 
Earnings Per Share$1.24 $1.24 $0.99 $0.99 
On April 5, 2022, ALLETE issued and sold approximately 3.7 million shares of ALLETE common stock. Net proceeds of approximately $224 million were received from the sale of shares. Proceeds were used primarily to fund the acquisition of New Energy and capital investments at ALLETE Clean Energy.