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EARNINGS PER SHARE AND COMMON STOCK (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Basic        
Net Income Attributable to ALLETE $ 45.0 $ 85.9 $ 128.7 $ 195.6
Average Common Shares (in shares) 57.8 57.4 57.7 57.3
Earnings Per Share (in usd per share) $ 0.78 $ 1.50 $ 2.23 $ 3.41
Diluted        
Net Income Attributable to ALLETE $ 45.0 $ 85.9 $ 128.7 $ 195.6
Average common shares adjustment (in shares) 0.1 0.1 0.1 0.1
Average common shares (in shares) 57.9 57.5 57.8 57.4
Earnings Per Share (in usd per share) $ 0.78 $ 1.49 $ 2.23 $ 3.41