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Investments (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Investments [Abstract]    
ALLETE Properties $ 90.0 $ 89.9
Available-for-sale Securities 18.9 [1] 17.7 [1]
Cash Equivalents 3.4 [2] 34.2 [2]
Other 4.4 4.5
Total Other Investments 116.7 146.3
Available-for-sale Corporate Debt Securities, Maturities, One Year or Less 0.2  
Available-for-sale Corporate Debt Securities, Maturities, More than One Year to Less than Three Years 2.3  
Available-for-sale Corporate Debt Securities, Maturities, Three Years to Less than Five Years 1.8  
Available-for-sale Corporate Debt Securities, Maturities, Five Years or More 6.2  
ALLETE Properties [Rollforward]    
Land Inventory Beginning Balance 85.4 86.5
Cost of Sales (0.2) (1.5)
Other 0.3 0.4
Land Inventory Ending Balance 85.5 85.4
Long-Term Finance Receivables (net of allowances of $0.6 and $0.6) 1.4 1.4
Other 3.1 3.1
Total Real Estate Assets 90.0 89.9
Impairment of Real Estate 0 0
Long-Term Finance Receivables, Allowance $ 0.6 $ 0.6
[1] As of June 30, 2014, the aggregate amount of available-for-sale corporate debt securities maturing in one year or less was $0.2 million, in one year to less than three years was $2.3 million, in three years to less than five years was $1.8 million, and in five or more years was $6.2 million.
[2] During the first three months of 2014, cash included in Other Investments was transferred to Cash and Cash Equivalents.