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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Comprehensive Income [Abstract]    
Net Income $ 49.0 $ 46.4
Other Comprehensive Income (Loss) [Abstract]    
Unrealized Gain (Loss) on Securities Net of Income Tax Expense (Benefit) of $0.3 and $(0.3) 0.3 (0.4)
Defined Benefit Pension and Other Postretirement Benefit Plans Net of Income Tax Expense of $0.1 and $0.1 0.2 0.2
Total Other Comprehensive Income (Loss) 0.5 (0.2)
Total Comprehensive Income 49.5 46.2
Less: Non-Controlling Interest in Subsidiaries 0.0 0.5
Total Comprehensive Income Attributable to ALLETE $ 49.5 $ 45.7