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Business Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Business Segments [Line Items]          
Operating Revenue $ 288.9 $ 251.0 $ 846.1 $ 750.4  
Fuel and Purchased Power Expense 88.9 80.5 268.7 245.7  
Operating and Maintenance Expense 105.7 102.7 340.6 311.2  
Depreciation Expense 33.5 29.4 99.5 86.3  
Operating Income (Loss) 60.8 38.4 137.3 107.2  
Interest Expense (13.2) (12.7) (39.5) (37.8)  
Equity Earnings in ATC 5.3 4.9 15.6 15.1  
Other Income 2.1 3.3 6.0 7.5  
Income (Loss) Before Non-Controlling Interest and Income Taxes 55.0 33.9 119.4 92.0  
Income Tax Expense (Benefit) 13.4 8.7 27.1 20.3  
Net Income (Loss) 41.6 25.2 92.3 71.7  
Less: Non-Controlling Interest in Subsidiaries 0 0 0.4 0  
Net Income (Loss) Attributable to ALLETE 41.6 25.2 91.9 71.7  
Total Assets 4,067.9 3,463.9 4,067.9 3,463.9 3,476.8
Property, Plant and Equipment - Net 3,121.5 2,456.1 3,121.5 2,456.1 2,576.5
Accumulated Depreciation 1,316.6 1,225.3 1,316.6 1,225.3  
Capital Additions     467.6 186.4  
Regulated Operations [Member]
          
Business Segments [Line Items]          
Operating Revenue 255.8 226.4 749.6 683.6  
Fuel and Purchased Power Expense 88.9 80.5 268.7 245.7  
Operating and Maintenance Expense 79.4 78.6 258.6 243.6  
Depreciation Expense 28.5 27.9 86.9 81.8  
Operating Income (Loss) 59.0 39.4 135.4 112.5  
Interest Expense (11.8) (10.4) (34.7) (31.5)  
Equity Earnings in ATC 5.3 4.9 15.6 15.1  
Other Income 2.1 1.2 5.9 3.4  
Income (Loss) Before Non-Controlling Interest and Income Taxes 54.6 35.1 122.2 99.5  
Income Tax Expense (Benefit) 13.4 10.5 29.6 26.5  
Net Income (Loss) 41.2 24.6 92.6 73.0  
Less: Non-Controlling Interest in Subsidiaries 0 0 0 0  
Net Income (Loss) Attributable to ALLETE 41.2 24.6 92.6 73.0  
Total Assets 3,519.9 3,086.3 3,519.9 3,086.3  
Property, Plant and Equipment - Net 2,888.5 2,384.1 2,888.5 2,384.1  
Accumulated Depreciation 1,244.7 1,165.8 1,244.7 1,165.8  
Capital Additions     452.9 177.6  
Investments and Other [Member]
          
Business Segments [Line Items]          
Land in Minnesota (in acres) 5,000   5,000    
Operating Revenue 33.1 24.6 96.5 66.8  
Fuel and Purchased Power Expense 0 0 0 0  
Operating and Maintenance Expense 26.3 24.1 82.0 67.6  
Depreciation Expense 5.0 1.5 12.6 4.5  
Operating Income (Loss) 1.8 (1.0) 1.9 (5.3)  
Interest Expense (1.4) (2.3) (4.8) (6.3)  
Equity Earnings in ATC 0 0 0 0  
Other Income 0 2.1 0.1 4.1  
Income (Loss) Before Non-Controlling Interest and Income Taxes 0.4 (1.2) (2.8) (7.5)  
Income Tax Expense (Benefit) 0 (1.8) (2.5) (6.2)  
Net Income (Loss) 0.4 0.6 (0.3) (1.3)  
Less: Non-Controlling Interest in Subsidiaries 0 0 0.4 0  
Net Income (Loss) Attributable to ALLETE 0.4 0.6 (0.7) (1.3)  
Total Assets 548.0 377.6 548.0 377.6  
Property, Plant and Equipment - Net 233.0 72.0 233.0 72.0  
Accumulated Depreciation 71.9 59.5 71.9 59.5  
Capital Additions     $ 14.7 $ 8.8