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Investments (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Available-for-sale Securities [Abstract]      
Cost $ 18.3 $ 27.4 $ 27.3
Gross Unrealized Gain 0 0.5 0.1
Gross Unrealized (Loss) (0.6) (1.1) (2.7)
Fair Value 17.7 26.8 24.7
Net Proceeds 16.1 1.5 7.8
Gross Realized Gain 2.2 0 0
Gross Realized (Loss) 0 0 0
Net Unrealized Gain (Loss) in Other Comprehensive Income 0 1.2 (0.3)
Investments [Abstract]      
ALLETE Properties 89.9 91.1  
Available-for-sale Securities 17.7 [1] 26.8 [1]  
Cash Equivalents 34.2 20.7  
Other 4.5 4.9  
Total Other Investments 146.3 143.5  
Available-for-sale Securities, Debt Maturities, One Year or Less 0.6    
Available-for-sale Securities, Debt Maturities, One Year to Less Than Three Years 4.7    
Available-for-sale Securities, Debt Maturities, Three Years to Less Than Five Years 2.0    
Available-for-sale Securities, Debt Maturities, Five or More Years 2.5    
ALLETE Properties [Roll Forward]      
Land Inventory Beginning Balance 86.5 86.0  
Cost of Sales (1.5) (0.2)  
Other 0.4 0.7  
Land Inventory Ending Balance 85.4 86.5 86.0
Long-Term Finance Receivables (net of allowances of $0.6 and $0.6) 1.4 1.4  
Other 3.1 3.2  
Total Real Estate Assets 89.9 91.1  
Land Impairment 0 0  
Long-Term Finance Receivables, Allowance $ 0.6 $ 0.6  
[1] As of December 31, 2013, the aggregate amount of available-for-sale corporate debt securities maturing in one year or less was $0.6 million, in one year to less than three years was $4.7 million, in three years to less than five years was $2.0 million, and in five or more years was $2.5 million.