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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]      
Net Income $ 121.7 $ 178.9 $ 131.3
Other Comprehensive Income (Loss)      
Unrealized Gain (Loss) on Securities Net of Income Tax Expense (Benefit) of $0.1, $0.1 and $(0.2) 0.1 0.3 (0.4)
Defined Benefit Pension and Other Postretirement Benefit Plans Net of Income Tax Expense (Benefit) of X.X, $2.4 and $(0.1) 2.3 3.6 (0.2)
Total Other Comprehensive Income (Loss) 2.4 3.9 (0.6)
Total Comprehensive Income 124.1 182.8 130.7
Net Loss Attributable to Non-Controlling Interest (57.6) (68.2) (58.0)
Total Comprehensive Income Attributable to ALLETE $ 181.7 $ 251.0 $ 188.7