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Consolidated Statement of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net Income $ 97.1 $ 93.6 $ 74.8
Other Comprehensive Income (Loss) [Abstract]      
Unrealized Gain (Loss) on Securities - Net of Income Taxes of $0.8, $(0.1) and $0.6 1.2 (0.3) 0.8
Unrealized Loss on Derivatives - Net of Income Taxes of $(0.1), $(0.2) and $- (0.2) (0.3) 0
Defined Benefit Pension and Other Postretirement Benefit Plans - Net of Income Taxes of $3.9, $(3.6), and $- 5.9 (5.1) 0
Total Other Comprehensive Income (Loss) 6.9 (5.7) 0.8
Total Comprehensive Income 104.0 87.9 75.6
Less: Non-Controlling Interest in Subsidiaries 0 (0.2) (0.5)
Comprehensive Income Attributable to ALLETE $ 104.0 $ 88.1 $ 76.1