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Consolidated Statement of Shareholders' Equity Consolidated Statement of Shareholders' Equity - 3 months ended Mar. 31, 2016 - USD ($)
$ in Millions
Total
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Common Stock [Member]
Beginning Balance at Dec. 31, 2015 $ 1,820.2 $ 573.3 $ (24.5) $ 1,271.4
Comprehensive Income [Abstract]        
Net Income 46.4 46.4    
Other Comprehensive Income – Net of Tax [Abstract]        
Unrealized Loss on Securities – Net (0.4)   (0.4)  
Defined Benefit Pension and Other Postretirement Plans – Net 0.2   0.2  
Total Comprehensive Income 46.2      
Non-Controlling Interest in Subsidiaries (0.5) (0.5)    
Total Comprehensive Income Attributable to ALLETE 45.7      
Common Stock Issued – Net 9.6     9.6
Dividends Declared (25.7) (25.7)    
Ending Balance at Mar. 31, 2016 $ 1,849.8 $ 593.5 $ (24.7) $ 1,281.0