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Business Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Business Segments [Line Items]          
Operating Revenue $ 260.7 $ 235.6 $ 557.2 $ 499.4  
Fuel and Purchased Power Expense 83.6 78.7 179.8 165.2  
Operating and Maintenance Expense 115.1 103.8 234.9 208.5  
Depreciation Expense 33.8 28.7 66.0 56.9  
Operating Income (Loss) 28.2 24.4 76.5 68.8  
Interest Expense (13.5) (12.8) (26.3) (25.1)  
Equity Earnings in ATC 5.2 5.0 10.3 10.2  
Other Income (Expense) 1.9 1.5 3.9 4.2  
Income (Loss) Before Non-Controlling Interest and Income Taxes 21.8 18.1 64.4 58.1  
Income Tax Expense (Benefit) 4.9 4.1 13.7 11.6  
Net Income (Loss) 16.9 14.0 50.7 46.5  
Less: Non-Controlling Interest in Subsidiaries 0.1 0 0.4 0  
Net Income (Loss) Attributable to ALLETE 16.8 14.0 50.3 46.5  
Total Assets 3,895.6 3,350.9 3,895.6 3,350.9 3,476.8
Property, Plant and Equipment - Net 3,020.4 2,397.2 3,020.4 2,397.2 2,576.5
Accumulated Depreciation 1,288.9 1,202.8 1,288.9 1,202.8  
Capital Additions     341.7 100.2  
Regulated Operations [Member]
          
Business Segments [Line Items]          
Operating Revenue 229.6 215.8 493.8 457.2  
Fuel and Purchased Power Expense 83.6 78.7 179.8 165.2  
Operating and Maintenance Expense 89.0 82.8 179.2 165.0  
Depreciation Expense 29.6 27.1 58.4 53.9  
Operating Income (Loss) 27.4 27.2 76.4 73.1  
Interest Expense (11.4) (10.4) (22.9) (21.1)  
Equity Earnings in ATC 5.2 5.0 10.3 10.2  
Other Income (Expense) 2.0 1.1 3.8 2.2  
Income (Loss) Before Non-Controlling Interest and Income Taxes 23.2 22.9 67.6 64.4  
Income Tax Expense (Benefit) 5.7 6.6 16.2 16.0  
Net Income (Loss) 17.5 16.3 51.4 48.4  
Less: Non-Controlling Interest in Subsidiaries 0 0 0 0  
Net Income (Loss) Attributable to ALLETE 17.5 16.3 51.4 48.4  
Total Assets 3,424.3 2,997.0 3,424.3 2,997.0  
Property, Plant and Equipment - Net 2,791.7 2,329.6 2,791.7 2,329.6  
Accumulated Depreciation 1,221.1 1,143.2 1,221.1 1,143.2  
Capital Additions     335.6 97.2  
Investments and Other [Member]
          
Business Segments [Line Items]          
Land in Minnesota (in acres) 5,000   5,000    
Operating Revenue 31.1 19.8 63.4 42.2  
Fuel and Purchased Power Expense 0 0 0 0  
Operating and Maintenance Expense 26.1 21.0 55.7 43.5  
Depreciation Expense 4.2 1.6 7.6 3.0  
Operating Income (Loss) 0.8 (2.8) 0.1 (4.3)  
Interest Expense (2.1) (2.4) (3.4) (4.0)  
Equity Earnings in ATC 0 0 0 0  
Other Income (Expense) (0.1) 0.4 0.1 2.0  
Income (Loss) Before Non-Controlling Interest and Income Taxes (1.4) (4.8) (3.2) (6.3)  
Income Tax Expense (Benefit) (0.8) (2.5) (2.5) (4.4)  
Net Income (Loss) (0.6) (2.3) (0.7) (1.9)  
Less: Non-Controlling Interest in Subsidiaries 0.1 0 0.4 0  
Net Income (Loss) Attributable to ALLETE (0.7) (2.3) (1.1) (1.9)  
Total Assets 471.3 353.9 471.3 353.9  
Property, Plant and Equipment - Net 228.7 67.6 228.7 67.6  
Accumulated Depreciation 67.8 59.6 67.8 59.6  
Capital Additions     $ 6.1 $ 3.0