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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Comprehensive Income [Abstract]    
Net Income $ 46.5 $ 43.4
Other Comprehensive Income (Loss) [Abstract]    
Unrealized Loss on Securities - Net of Income Tax Expense $- and $- (0.3) 0.0
Defined Benefit Pension and Other Postretirement Benefit Plans - Net of Income Tax Expense of $0.1 and $0.1 0.1 0.4
Total Other Comprehensive Income (Loss) (0.2) 0.4
Total Comprehensive Income 46.3 43.8
Net Loss Attributable to Non-Controlling Interest (19.8) (8.4)
Total Comprehensive Income Attributable to ALLETE $ 66.1 $ 52.2