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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Comprehensive Income [Abstract]        
Net Income $ 24.8 $ 22.3 $ 71.2 $ 62.4
Other Comprehensive Income [Abstract]        
Unrealized Gain on Securities Net of Income Taxes of $0.3, $–, $–, and $0.1 0.4 0.0 0.0 0.1
Unrealized Gain on Derivatives Net of Income Taxes of $–, $0.1, $–, and $0.1 0.0 0.0 0.0 0.1
Defined Benefit Pension and Other Postretirement Benefit Plans Net of Income Taxes of $0.1, $0.2, $0.2, and $0.4 0.1 0.4 0.3 0.7
Total Other Comprehensive Income 0.5 0.4 0.3 0.9
Total Comprehensive Income 25.3 22.7 71.5 63.3
Less: Non-Controlling Interest in Subsidiaries 0.0 (0.2) 0.5 0.0
Total Comprehensive Income Attributable to ALLETE $ 25.3 $ 22.9 $ 71.0 $ 63.3