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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Comprehensive Income [Abstract]        
Net Income $ 20.8 $ 21.7 $ 67.3 $ 65.1
Other Comprehensive Income (Loss) [Abstract]        
Unrealized Loss on Securities - Net of Income Tax Expense $(0.2), $-, $(0.2) and $- (0.1) 0.0 (0.4) 0.0
Defined Benefit Pension and Other Postretirement Benefit Plans - Net of Income Tax Expense of $-, $0.2, $0.1 and $0.3 0.2 0.4 0.3 0.8
Total Other Comprehensive Income (Loss) 0.1 0.4 (0.1) 0.8
Total Comprehensive Income 20.9 22.1 67.2 65.9
Net Loss Attributable to Non-Controlling Interest (16.8) (6.2) (36.6) (14.6)
Total Comprehensive Income Attributable to ALLETE $ 37.7 $ 28.3 $ 103.8 $ 80.5