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EARNINGS PER SHARE AND COMMON STOCK (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Basic        
Net Income Attributable to ALLETE $ 31.9 $ 33.0 $ 88.0 $ 83.7
Average Common Shares (in shares) 58.0 57.7 58.0 57.7
Earnings Per Share (in usd per share) $ 0.55 $ 0.57 $ 1.52 $ 1.45
Diluted        
Net Income Attributable to ALLETE $ 31.9 $ 33.0 $ 88.0 $ 83.7
Average Common Shares Diluted Securities (in shares) 0.1 0.1 0.0 0.0
Average Common Shares (in shares) 58.1 57.8 58.0 57.7
Earnings Per Share (in usd per share) $ 0.55 $ 0.57 $ 1.52 $ 1.45