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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Comprehensive Income [Abstract]        
Net Income $ 40.7 $ 20.8 $ 78.3 $ 67.3
Other Comprehensive Income (Loss) [Abstract]        
Unrealized Loss on Securities - Net of Income Tax Expense $-, $(0.2), $0.1 and $($0.2) 0.0 (0.1) 0.1 (0.4)
Defined Benefit Pension and Other Postretirement Benefit Plans - Net of Income Tax Expense of $90.1), $-, $(0.1) and $0.1 (0.1) 0.2 (0.1) 0.3
Total Other Comprehensive Income (Loss) (0.1) 0.1 0.0 (0.1)
Total Comprehensive Income 40.6 20.9 78.3 67.2
Net Loss Attributable to Non-Controlling Interest (10.8) (16.8) (31.4) (36.6)
Total Comprehensive Income Attributable to ALLETE $ 51.4 $ 37.7 $ 109.7 $ 103.8