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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Comprehensive Income [Abstract]      
Net Income $ 178.9 $ 131.3 $ 137.8
Other Comprehensive Income (Loss)      
Net of Income Tax Expense (Benefit) of $0.1, $(0.2) and $(0.1) 0.3 (0.4) (0.1)
Net of Income Tax Expense (Benefit) of $2.4, $(0.1) and $3.0 3.6 (0.2) 7.4
Total Other Comprehensive Income (Loss) 3.9 (0.6) 7.3
Total Comprehensive Income 182.8 130.7 145.1
Net Loss Attributable to Non-Controlling Interest (68.2) (58.0) (31.4)
Total Comprehensive Income Attributable to ALLETE $ 251.0 $ 188.7 $ 176.5