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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Comprehensive Income [Abstract]    
Net Income $ 43.4 $ 64.5
Other Comprehensive Income (Loss) [Abstract]    
Unrealized Loss on Securities Net of Income Tax Benefit of $– and $(0.1) 0.0 (0.4)
Defined Benefit Pension and Other Postretirement Benefit Plans Net of Income Tax Expense of $0.1 and $0.1 0.4 0.2
Total Other Comprehensive Income (Loss) 0.4 (0.2)
Total Comprehensive Income 43.8 64.3
Net Loss Attributable to Non-Controlling Interest (8.4) (1.8)
Total Comprehensive Income Attributable to ALLETE $ 52.2 $ 66.1