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Investments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
Investments [Abstract]      
ALLETE Properties $ 89.4 $ 89.4 $ 89.9
Available-for-sale Securities 19.0 [1] 19.0 [1] 17.7 [1]
Cash Equivalents 3.7 [2] 3.7 [2] 34.2 [2]
Other 4.3 4.3 4.5
Total Other Investments 116.4 116.4 146.3
Available-for-sale Corporate Debt Securities, Maturities, One Year or Less 0.2 0.2  
Available-for-sale Corporate Debt Securities, Maturities, More than One Year to Less than Three Years 2.1 2.1  
Available-for-sale Corporate Debt Securities, Maturities, Three Years to Less than Five Years 1.3 1.3  
Available-for-sale Corporate Debt Securities, Maturities, Five Years or More 7.1 7.1  
ALLETE Properties [Rollforward]      
Land Inventory Beginning Balance   85.4 86.5
Cost of Sales   (1.1) (1.5)
Other   0.5 0.4
Land Inventory Ending Balance 84.8 84.8 85.4
Long-Term Finance Receivables (net of allowances of $0.6 and $0.6) 1.4 1.4 1.4
Other 3.2 3.2 3.1
Total Real Estate Assets 89.4 89.4 89.9
Impairment of Real Estate 0 0 0
Long-Term Finance Receivable, Allowance $ 0.6 $ 0.6 $ 0.6
[1] As of September 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 $2.1 million, in three years to less than five years was $1.3 million, and in five or more years was $7.1 million.
[2] During the first quarter of 2014, cash included in Other Investments was transferred to Cash and Cash Equivalents.