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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, 2020   $ 1,460.9 $ (31.1) $ 856.0 $ 505.6
Consolidated Statement of Equity [Roll Forward]          
Common Stock Issued $ 51.0 75.8      
Unrealized Gain (Loss) on Debt Securities (0.1)   (0.1)    
Defined Benefit Pension and Other Postretirement Plans 7.4   7.4    
Net Income Attributable to ALLETE 169.2     169.2  
Common Stock Dividends 131.9     (131.9)  
Adjustment of Redeemable Non-Controlling Interest       (1.9)  
Proceeds from Non-Controlling Interest in Subsidiaries – Net of Issuance Costs         90.9
Net Loss Attributable to Non-Controlling Interest 31.4       (31.4)
Reclassification of Redeemable Non-Controlling Interest to Current Liabilities         (28.8)
Distributions to Non-Controlling Interest         (3.1)
Balance, End of Period at Dec. 31, 2021 2,937.5 1,536.7 (23.8) 891.4 533.2
Balance, Beginning of Period at Dec. 31, 2020 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 Dec. 31, 2021 $ 0.0        
Redeemable Non-Controlling Interest          
Dividends Per Share of Common Stock (in usd per share) $ 2.52        
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     (145.9)  
Adjustment of Redeemable Non-Controlling Interest       0.0  
Proceeds from Non-Controlling Interest in Subsidiaries – Net of Issuance Costs         182.9
Net Loss Attributable to Non-Controlling Interest 58.0       (58.0)
Reclassification of Redeemable Non-Controlling Interest to Current Liabilities         0.0
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
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 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     (155.5)  
Adjustment of Redeemable Non-Controlling Interest       0.0  
Proceeds from Non-Controlling Interest in Subsidiaries – Net of Issuance Costs         9.9
Net Loss Attributable to Non-Controlling Interest 68.2       (60.8)
Reclassification of Redeemable Non-Controlling Interest to Current Liabilities         0.0
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)        
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