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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, 2021   $ 1,536.7 $ (23.8) $ 891.4 $ 533.2
Consolidated Statement of Equity [Roll Forward]          
Common Stock Issued   244.8      
Unrealized Gain (Loss) on Debt Securities $ (0.4)   (0.4)    
Defined Benefit Pension and Other Postretirement Plans (0.2)   (0.2)    
Net Income Attributable to ALLETE 189.3     189.3  
Common Stock Dividends       (145.9)  
Proceeds from Non-Controlling Interest in Subsidiaries – Net of Issuance Costs         182.9
Net Loss Attributable to Non-Controlling Interest 58.0       (58.0)
Distributions to Non-Controlling Interest         (1.7)
Balance, End of Period at Dec. 31, 2022 3,348.3 1,781.5 (24.4) 934.8 656.4
Balance, Beginning of Period at Dec. 31, 2021 0.0        
Redeemable Non-Controlling Interest          
Proceeds from Non-Controlling Interest in Subsidiaries 0.0        
Net Loss Attributable to Non-Controlling Interest 0.0        
Distributions to Non-Controlling Interest 0.0        
Total Redeemable Non-Controlling Interest at Dec. 31, 2022 $ 0.0        
Redeemable Non-Controlling Interest          
Dividends Per Share of Common Stock (in usd per share) $ 2.60        
Common Stock Issued   22.2      
Unrealized Gain (Loss) on Debt Securities $ 0.3   0.3    
Defined Benefit Pension and Other Postretirement Plans 3.6   3.6    
Net Income Attributable to ALLETE 247.1     247.1  
Common Stock Dividends       (155.5)  
Proceeds from Non-Controlling Interest in Subsidiaries – Net of Issuance Costs         9.9
Net Loss Attributable to Non-Controlling Interest 68.2       (60.8)
Distributions to Non-Controlling Interest         (8.5)
Balance, End of Period at Dec. 31, 2023 3,406.6 1,803.7 (20.5) 1,026.4 597.0
Redeemable Non-Controlling Interest          
Proceeds from Non-Controlling Interest in Subsidiaries 7.9        
Net Loss Attributable to Non-Controlling Interest (7.4)        
Distributions to Non-Controlling Interest 0.0        
Total Redeemable Non-Controlling Interest at Dec. 31, 2023 $ 0.5        
Redeemable Non-Controlling Interest          
Dividends Per Share of Common Stock (in usd per share) $ 2.71        
Common Stock Issued   19.5      
Unrealized Gain (Loss) on Debt Securities $ 0.1   0.1    
Defined Benefit Pension and Other Postretirement Plans 2.3   2.3    
Net Income Attributable to ALLETE 179.3     179.3  
Common Stock Dividends       (162.8)  
Proceeds from Non-Controlling Interest in Subsidiaries – Net of Issuance Costs         1.3
Net Loss Attributable to Non-Controlling Interest 57.6       (55.0)
Distributions to Non-Controlling Interest         (1.2)
Balance, End of Period at Dec. 31, 2024 3,390.1 $ 1,823.2 $ (18.1) $ 1,042.9 $ 542.1
Redeemable Non-Controlling Interest          
Proceeds from Non-Controlling Interest in Subsidiaries 2.8        
Net Loss Attributable to Non-Controlling Interest (2.6)        
Distributions to Non-Controlling Interest (0.3)        
Total Redeemable Non-Controlling Interest at Dec. 31, 2024 $ 0.4        
Redeemable Non-Controlling Interest          
Dividends Per Share of Common Stock (in usd per share) $ 2.82