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Consolidated Statement of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Revenue [Abstract]      
Contracts with Customers – Utility $ 1,238.3 $ 1,259.3 $ 1,227.9
Contracts with Customers – Non-utility 636.4 303.8 179.9
Other – Non-utility 5.1 7.6 11.4
Total Operating Revenue 1,879.8 1,570.7 1,419.2
Operating Expenses      
Fuel, Purchased Power and Gas – Utility 482.9 545.5 562.4
Transmission Services – Utility 88.2 76.7 75.3
Cost of Sales – Non-utility 473.5 182.8 68.8
Operating and Maintenance 345.3 318.9 259.2
Depreciation and Amortization 251.8 242.2 231.7
Taxes Other than Income Taxes 57.2 70.4 70.5
Total Operating Expenses 1,698.9 1,436.5 1,267.9
Operating Income 180.9 134.2 151.3
Other Income (Expense)      
Interest Expense (80.8) (75.2) (69.1)
Equity Earnings 21.7 18.7 20.0
Other 85.0 22.4 8.7
Total Other Income (Expense) 25.9 (34.1) (40.4)
Income Before Non-Controlling Interest and Income Taxes 206.8 100.1 110.9
Income Tax Expense (Benefit) 27.9 (31.2) (26.9)
Net Income 178.9 131.3 137.8
Net Loss Attributable to Non-Controlling Interest (68.2) (58.0) (31.4)
Net Income Attributable to ALLETE $ 247.1 $ 189.3 $ 169.2
Average Shares of Common Stock      
Basic (in shares) 57.3 55.9 52.4
Diluted (in shares) 57.4 56.0 52.5
Basic Earnings Per Share of Common Stock (in usd per share) $ 4.31 $ 3.38 $ 3.23
Diluted Earnings Per Share of Common Stock (in dollars per share) $ 4.30 $ 3.38 $ 3.23