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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Comprehensive Income [Abstract]    
Net Income $ 37.6 $ 46.5
Other Comprehensive Income (Loss) [Abstract]    
Unrealized Loss on Securities - Net of Income Tax Expense $0.1 and $- 0.1 (0.3)
Defined Benefit Pension and Other Postretirement Benefit Plans - Net of Income Tax Expense of $- and $0.1 0.0 0.1
Total Other Comprehensive Income (Loss) 0.1 (0.2)
Total Comprehensive Income 37.7 46.3
Net Loss Attributable to Non-Controlling Interest (20.6) (19.8)
Total Comprehensive Income Attributable to ALLETE $ 58.3 $ 66.1