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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2023
Selected Quarterly Financial Information [Abstract]  
Quarterly Financial Data (Unaudited) QUARTERLY FINANCIAL DATA (UNAUDITED)
Information for any one quarterly period is not necessarily indicative of the results which may be expected for the year.
Quarter EndedMar. 31Jun. 30Sept. 30Dec. 31
Millions Except Earnings Per Share    
2023    
Operating Revenue$564.9 $533.4 $378.8 $402.7 
Operating Income$48.3 $53.5 $36.0 $43.1 
Net Income Attributable to ALLETE$58.2 $51.5 $85.9 $51.5 
Earnings Per Share of Common Stock    
Basic$1.02 $0.90 $1.50 $0.89 
Diluted$1.02 $0.90 $1.49 $0.89 
2022    
Operating Revenue$383.5 $373.1 $388.3 $425.8 
Operating Income$53.4 $13.7 $33.4 $33.7 
Net Income Attributable to ALLETE$66.3 $37.6 $33.7 $51.7 
Earnings Per Share of Common Stock    
Basic$1.24 $0.67 $0.59 $0.90 
Diluted$1.24 $0.67 $0.59 $0.90 
2021
Operating Revenue$339.2 $335.6 $345.4 $399.0 
Operating Income$42.0 $28.2 $31.1 $50.0 
Net Income Attributable to ALLETE$51.8 $27.9 $27.6 $61.9 
Earnings Per Share of Common Stock
Basic$0.99 $0.53 $0.53 $1.18 
Diluted$0.99 $0.53 $0.53 $1.18