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Consolidated Statement of Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Accumulated Other Comprehensive Loss [Member]
Retained Earnings [Member]
Non-Controlling Interest in Subsidiaries [Member]
Balance, Beginning of Period at Dec. 31, 2018   $ 1,428.5 $ (27.3) $ 754.6 $ 0.0
Consolidated Statement of Equity [Roll Forward]          
Common Stock Issued   8.2      
Unrealized Gain (Loss) on Debt Securities $ 0.2   0.2    
Defined Benefit Pension and Other Postretirement Plans 3.5   3.5    
Net Loss Attributable to Non-Controlling Interest (0.1)       (0.1)
Reclassification of Redeemable Non-Controlling Interest to Current Liabilities         0.0
Distributions to Non-Controlling Interest         0.0
Net Income Attributable to ALLETE 185.6     185.6  
Common Stock Dividends 121.4     (121.4)  
Adjustment of Redeemable Non-Controlling Interest       0.0  
Proceeds from Non-Controlling Interest - Net of Issuance Costs 103.8       103.8
Balance, Ending of Period at Dec. 31, 2019 $ 2,335.6 1,436.7 (23.6) 818.8 103.7
Consolidated Statement of Equity [Roll Forward]          
Dividends Per Share of Common Stock $ 2.35        
Common Stock Issued   24.2      
Unrealized Gain (Loss) on Debt Securities $ 0.1   0.1    
Defined Benefit Pension and Other Postretirement Plans (7.6)   (7.6)    
Net Loss Attributable to Non-Controlling Interest (12.6)       (12.6)
Reclassification of Redeemable Non-Controlling Interest to Current Liabilities         0.0
Distributions to Non-Controlling Interest         0.0
Net Income Attributable to ALLETE 174.2     174.2  
Common Stock Dividends 128.2     (128.2)  
Adjustment of Redeemable Non-Controlling Interest       0.0  
Proceeds from Non-Controlling Interest - Net of Issuance Costs 414.5       414.5
Balance, Ending of Period at Dec. 31, 2020 $ 2,800.2 1,460.9 (31.1) 864.8 505.6
Consolidated Statement of Equity [Roll Forward]          
Dividends Per Share of Common Stock $ 2.47        
Common Stock Issued   75.8      
Unrealized Gain (Loss) on Debt Securities $ (0.1)   (0.1)    
Defined Benefit Pension and Other Postretirement Plans 7.4   7.4    
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)
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 - Net of Issuance Costs 90.9       90.9
Balance, Ending of Period at Dec. 31, 2021 $ 2,946.3 $ 1,536.7 $ (23.8) $ 900.2 $ 533.2
Consolidated Statement of Equity [Roll Forward]          
Dividends Per Share of Common Stock $ 2.52