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Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accumulated Other Comprehensive Income (Loss) [Abstract]      
Unrealized Loss on Securities $ (1.3) $ (1.0)  
Unrealized Loss on Derivatives (0.3) 0  
Defined Benefit Pension and Other Postretirement Plans (27.3) (22.2)  
Total Accumulated Other Comprehensive Loss (28.9) (23.2)  
Comprehensive Income (Loss) [Abstract]      
Net Income 93.6 74.8 60.7
Other Comprehensive Income (Loss) [Abstract]      
Unrealized Gain (Loss) on Securities Net of income taxes of $(0.1), $0.6, and $1.7 (0.3) 0.8 2.8
Unrealized Loss on Derivatives Net of income taxes of $(0.2) $-, and $- (0.3) 0 0
Defined Benefit Pension and Other Postretirement Plans Net of income taxes of $(3.6), $-, and $4.1 (5.1) 0 6.2
Total Other Comprehensive Income (Loss) (5.7) 0.8 9.0
Total Comprehensive Income 87.9 75.6 69.7
Less: Non-Controlling Interest in Subsidiaries (0.2) (0.5) (0.3)
Comprehensive Income Attributable to ALLETE 88.1 76.1 70.0
Unrealized Gain (Loss) on Securities, Income Taxes (0.1) 0.6 1.7
Unrealized Loss on Derivatives, Income Taxes (0.2) 0 0
Defined Benefit Pension and Other Postretirement Plans, Income Taxes $ (3.6) $ 0 $ 4.1