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Consolidated Statement of Comprehensive Income Unaudited - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Comprehensive Income [Abstract]    
Net Income $ 37.0 $ 37.6
Other Comprehensive Income (Loss)    
Net of Income Tax Expense of $– and $0.1 0.0 0.1
Net of Income Tax Expense of $0.1 and $– (0.4) 0.0
Total Other Comprehensive Income (Loss) (0.4) 0.1
Total Comprehensive Income 36.6 37.7
Net Loss Attributable to Non-Controlling Interest (13.7) (20.6)
Total Comprehensive Income Attributable to ALLETE $ 50.3 $ 58.3