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Consolidated Statement of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Comprehensive Income (Loss) [Abstract]        
Net Income $ 29.4 $ 20.5 $ 68.2 $ 74.5
Other Comprehensive Income (Loss) [Abstract]        
Unrealized Gain (Loss) on Securities, Net of Income Taxes of $0.5, $(1.1), $0.7 and $(0.3) 0.5 (1.4) 1.0 (0.3)
Unrealized Loss on Derivatives, Net of Income Taxes of $(0.1), $(0.2), $(0.2) and $(0.2) 0 (0.3) (0.2) (0.3)
Defined Benefit Pension and Other Postretirement Benefit Plans, Net of Income Taxes of $0.2, $0.3, $0.9 and $0.8 0.4 0.3 1.4 1.1
Total Other Comprehensive Income (Loss) 0.9 (1.4) 2.2 0.5
Total Comprehensive Income 30.3 19.1 70.4 75.0
Less: Non-Controlling Interest in Subsidiaries 0 0 0 (0.2)
Comprehensive Income Attributable to ALLETE $ 30.3 $ 19.1 $ 70.4 $ 75.2