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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   11.0      
Unrealized Gain on Debt Securities $ 0.0   0.0    
Defined Benefit Pension and Other Postretirement Plans 0.3   0.3    
Net Income Attributable ALLETE 86.4     86.4  
Common Stock Dividends 63.9     (63.9)  
Proceeds from Non-controlling Interest in Subsidiaries 67.8       67.8
Net Loss Attributable to Non-Controlling Interest (5.0)       (5.0)
Distributions to Non-controlling Interest         0.0
Balance, End of Period at Jun. 30, 2020 $ 2,432.2 1,447.7 (23.3) 841.3 166.5
Consolidated Statement of Equity [Roll Forward]          
Dividends Per Share of Common Stock $ 1.235        
Balance, Beginning Balance at Mar. 31, 2020   1,441.7 (23.8) 853.2 101.9
Consolidated Statement of Equity [Roll Forward]          
Common Stock Issued   6.0      
Unrealized Gain on Debt Securities $ 0.4   0.4    
Defined Benefit Pension and Other Postretirement Plans 0.1   0.1    
Net Income Attributable ALLETE 20.1     20.1  
Common Stock Dividends       (32.0)  
Proceeds from Non-controlling Interest in Subsidiaries         67.8
Net Loss Attributable to Non-Controlling Interest (3.2)       (3.2)
Distributions to Non-controlling Interest         0.0
Balance, End of Period at Jun. 30, 2020 $ 2,432.2 1,447.7 (23.3) 841.3 166.5
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   13.2      
Unrealized Gain on Debt Securities 0.0   0.0    
Defined Benefit Pension and Other Postretirement Plans 0.8   0.8    
Net Income Attributable ALLETE 79.7     79.7  
Common Stock Dividends 65.7     (65.7)  
Proceeds from Non-controlling Interest in Subsidiaries 28.9       28.9
Net Loss Attributable to Non-Controlling Interest (14.6)       (14.6)
Distributions to Non-controlling Interest         (0.6)
Balance, End of Period at Jun. 30, 2021 $ 2,841.9 1,474.1 (30.3) 878.8 519.3
Consolidated Statement of Equity [Roll Forward]          
Dividends Per Share of Common Stock $ 1.26        
Balance, Beginning Balance at Mar. 31, 2021   1,467.6 (30.7) 883.8 525.7
Consolidated Statement of Equity [Roll Forward]          
Common Stock Issued   6.5      
Unrealized Gain on Debt Securities $ 0.0   0.0    
Defined Benefit Pension and Other Postretirement Plans 0.4   0.4    
Net Income Attributable ALLETE 27.9     27.9  
Common Stock Dividends       (32.9)  
Proceeds from Non-controlling Interest in Subsidiaries         0.0
Net Loss Attributable to Non-Controlling Interest (6.2)       (6.2)
Distributions to Non-controlling Interest         (0.2)
Balance, End of Period at Jun. 30, 2021 $ 2,841.9 $ 1,474.1 $ (30.3) $ 878.8 $ 519.3
Consolidated Statement of Equity [Roll Forward]          
Dividends Per Share of Common Stock $ 0.63