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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 [Member]
Balance, Beginning Balance at Dec. 31, 2019   $ 1,436.7 $ (23.6) $ 818.8 $ 103.7
Consolidated Statement of Equity [Roll Forward]          
Common Stock Issued   17.5      
Defined Benefit Pension and Other Postretirement Plans $ 0.5   0.5    
Net Income Attributable ALLETE 127.1     127.1  
Common Stock Dividends 96.0     (96.0)  
Proceeds from Non-controlling Interest in Subsidiaries 67.8       67.8
Net Loss Attributable to Non-Controlling Interest (6.9)       (6.9)
Distributions to Non-controlling Interest         0.0
Balance, End of Period at Sep. 30, 2020 $ 2,445.6 1,454.2 (23.1) 849.9 164.6
Consolidated Statement of Equity [Roll Forward]          
Dividends Per Share of Common Stock $ 1.8525        
Balance, Beginning Balance at Jun. 30, 2020   1,447.7 (23.3) 841.3 166.5
Consolidated Statement of Equity [Roll Forward]          
Common Stock Issued   6.5      
Defined Benefit Pension and Other Postretirement Plans $ 0.2   0.2    
Net Income Attributable ALLETE 40.7     40.7  
Common Stock Dividends       (32.1)  
Proceeds from Non-controlling Interest in Subsidiaries         0.0
Net Loss Attributable to Non-Controlling Interest (1.9)       (1.9)
Distributions to Non-controlling Interest         0.0
Balance, End of Period at Sep. 30, 2020 $ 2,445.6 1,454.2 (23.1) 849.9 164.6
Consolidated Statement of Equity [Roll Forward]          
Dividends Per Share of Common Stock $ 0.6175        
Balance, Beginning Balance at Dec. 31, 2020 $ 2,800.2 1,460.9 (31.1) 864.8 505.6
Consolidated Statement of Equity [Roll Forward]          
Common Stock Issued   35.6      
Defined Benefit Pension and Other Postretirement Plans 1.2   1.2    
Net Income Attributable ALLETE 107.3     107.3  
Common Stock Dividends 98.7     (98.7)  
Proceeds from Non-controlling Interest in Subsidiaries 28.9       28.9
Net Loss Attributable to Non-Controlling Interest (18.1)       (18.1)
Distributions to Non-controlling Interest         (1.9)
Balance, End of Period at Sep. 30, 2021 $ 2,854.5 1,496.5 (29.9) 873.4 514.5
Consolidated Statement of Equity [Roll Forward]          
Dividends Per Share of Common Stock $ 1.89        
Balance, Beginning Balance at Jun. 30, 2021   1,474.1 (30.3) 878.8 519.3
Consolidated Statement of Equity [Roll Forward]          
Common Stock Issued   22.4      
Defined Benefit Pension and Other Postretirement Plans $ 0.4   0.4    
Net Income Attributable ALLETE 27.6     27.6  
Common Stock Dividends       (33.0)  
Proceeds from Non-controlling Interest in Subsidiaries         0.0
Net Loss Attributable to Non-Controlling Interest (3.5)       (3.5)
Distributions to Non-controlling Interest         (1.3)
Balance, End of Period at Sep. 30, 2021 $ 2,854.5 $ 1,496.5 $ (29.9) $ 873.4 $ 514.5
Consolidated Statement of Equity [Roll Forward]          
Dividends Per Share of Common Stock $ 0.63