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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Comprehensive Income [Abstract]      
Net Income $ 137.8 $ 161.6 $ 185.5
Other Comprehensive Income (Loss) [Abstract]      
Unrealized Gain (Loss) on Securities - Net of Income Tax Expense (Benefit) of $(0.1), $0.1 and $0.1 (0.1) 0.1 0.2
Defined Benefit Pension and Other Postretirement Benefit Plans - Net of Income Tax Expense (Benefit) of $3.0, $(3.1) and $1.4 7.4 (7.6) 3.5
Total Other Comprehensive Income (Loss) 7.3 (7.5) 3.7
Total Comprehensive Income 145.1 154.1 189.2
Net Loss Attributable to Non-Controlling Interest (31.4) (12.6) (0.1)
Total Comprehensive Income Attributable to ALLETE $ 176.5 $ 166.7 $ 189.3