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Consolidated Statement of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Comprehensive Income [Abstract]        
Net Income $ 16.9 $ 14.0 $ 50.7 $ 46.5
Other Comprehensive Income [Abstract]        
Unrealized Gain on Securities, Net of Income Taxes of $0.1, $0.1, $0.1, and $0.1 0.2 0.1 0.2 0.1
Unrealized Gain on Derivatives, Net of Income Taxes of $-, $0.1, $0.1 and $0.1 0 0 0 0.1
Defined Benefit Pension and Other Postretirement Benefit Plans, Net of Income Taxes of $0.2, $0.3, $0.4 and $0.5 0.3 0.5 0.6 0.8
Total Other Comprehensive Income 0.5 0.6 0.8 1.0
Total Comprehensive Income 17.4 14.6 51.5 47.5
Less: Non-Controlling Interest in Subsidiaries 0.1 0 0.4 0
Comprehensive Income Attributable to ALLETE $ 17.3 $ 14.6 $ 51.1 $ 47.5