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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   5.0      
Unrealized Loss on Debt Securities $ (0.4)   (0.4)    
Defined Benefit Pension and Other Postretirement Plans 0.2   0.2    
Net Income Attributable ALLETE 66.3     66.3  
Common Stock Dividends 31.9     (31.9)  
Proceeds from Non-controlling Interests 0.0       0.0
Net Loss Attributable to Non-Controlling Interest (1.8)       (1.8)
Distributions to Non-controlling Interest         0.0
Balance, End of Period at Mar. 31, 2020 $ 2,373.0 1,441.7 (23.8) 853.2 101.9
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   6.7      
Unrealized Loss on Debt Securities 0.0   0.0    
Defined Benefit Pension and Other Postretirement Plans 0.4   0.4    
Net Income Attributable ALLETE 51.8     51.8  
Common Stock Dividends 32.8     (32.8)  
Proceeds from Non-controlling Interests 28.9       28.9
Net Loss Attributable to Non-Controlling Interest (8.4)       (8.4)
Distributions to Non-controlling Interest         (0.4)
Balance, End of Period at Mar. 31, 2021 $ 2,846.4 $ 1,467.6 $ (30.7) $ 883.8 $ 525.7
Consolidated Statement of Equity [Roll Forward]          
Dividends Per Share of Common Stock $ 0.63