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Consolidated Statement of Equity - USD ($)
$ in Millions
Total
Common Stock
Accumulated Other Comprehensive Loss
Retained Earnings
Non-Controlling Interest in Subsidiaries
Balance, Beginning of Period at Dec. 31, 2022   $ 1,781.5 $ (24.4) $ 934.8 $ 656.4
Consolidated Statement of Equity [Roll Forward]          
Common Stock Issued   4.1      
Unrealized Gain on Debt Securities $ 0.1   0.1    
Defined Benefit Pension and Other Postretirement Plans 0.0   0.0    
Net Income Attributable to ALLETE 58.2     58.2  
Common Stock Dividends       (38.8)  
Proceeds from Non-Controlling Interest in Subsidiaries – Net         6.7
Net Loss Attributable to Non-Controlling Interest 20.6       (20.6)
Distributions to Non-Controlling Interest         (0.3)
Balance, End of Period at Mar. 31, 2023 3,357.7 1,785.6 (24.3) 954.2 642.2
Balance, Beginning of Period at Dec. 31, 2022 0.0        
Redeemable Non-Controlling Interest          
Proceeds from Non-Controlling Interest in Subsidiaries 0.0        
Net Loss Attributable to Non-Controlling Interest 0.0        
Total Redeemable Non-Controlling Interest at Mar. 31, 2023 $ 0.0        
Redeemable Non-Controlling Interest          
Dividends Per Share of Common Stock (in usd per share $ 0.6775        
Balance, Beginning of Period at Dec. 31, 2023 $ 3,406.6 1,803.7 (20.5) 1,026.4 597.0
Consolidated Statement of Equity [Roll Forward]          
Common Stock Issued   3.7      
Unrealized Gain on Debt Securities 0.0   0.0    
Defined Benefit Pension and Other Postretirement Plans (0.4)   (0.4)    
Net Income Attributable to ALLETE 50.7     50.7  
Common Stock Dividends       (40.6)  
Proceeds from Non-Controlling Interest in Subsidiaries – Net         0.0
Net Loss Attributable to Non-Controlling Interest 13.7       (11.0)
Distributions to Non-Controlling Interest         (0.5)
Balance, End of Period at Mar. 31, 2024 3,408.5 $ 1,807.4 $ (20.9) $ 1,036.5 $ 585.5
Balance, Beginning of Period at Dec. 31, 2023 0.5        
Redeemable Non-Controlling Interest          
Proceeds from Non-Controlling Interest in Subsidiaries 2.7        
Net Loss Attributable to Non-Controlling Interest (2.7)        
Total Redeemable Non-Controlling Interest at Mar. 31, 2024 $ 0.5        
Redeemable Non-Controlling Interest          
Dividends Per Share of Common Stock (in usd per share $ 0.705