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Consolidated Statement of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Comprehensive Income [Abstract]        
Net Income $ 41.6 $ 25.2 $ 92.3 $ 71.7
Other Comprehensive Income [Abstract]        
Unrealized Gain (Loss) on Securities, Net of Income Taxes of $-, $(0.3), $0.1, and $(0.2) (0.1) (0.5) 0.1 (0.4)
Unrealized Gain (Loss) on Derivatives, Net of Income Taxes of $-, $(0.1), $0.1 and $- 0.1 (0.1) 0.1 0
Defined Benefit Pension and Other Postretirement Benefit Plans, Net of Income Taxes of $0.2, $0.3, $0.6 and $0.8 0.2 0.3 0.8 1.1
Total Other Comprehensive Income (Loss) 0.2 (0.3) 1.0 0.7
Total Comprehensive Income 41.8 24.9 93.3 72.4
Less: Non-Controlling Interest in Subsidiaries 0 0 0.4 0
Comprehensive Income Attributable to ALLETE $ 41.8 $ 24.9 $ 92.9 $ 72.4