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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME Unaudited - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Statement of Comprehensive Income [Abstract]    
Net Income $ 34.7 $ 37.0
Other Comprehensive Loss    
Unrealized Gain on Securities: Net of Income Tax Expense of XX and $0 0.0 0.0
Defined Benefit Pension and Other Postretirement Benefit Plans: Net of Income Tax Benefit of XX and $0.1 0.0 (0.4)
Total Other Comprehensive Loss 0.0 (0.4)
Total Comprehensive Income 34.7 36.6
Net Loss Attributable to Non-Controlling Interest (21.4) (13.7)
Total Comprehensive Income Attributable to ALLETE $ 56.1 $ 50.3