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Consolidated Statement of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Revenue      
Contracts with Customers – Utility $ 1,242.7 $ 1,238.3 $ 1,259.3
Contracts with Customers – Non-utility 282.1 636.4 303.8
Other – Non-utility 5.0 5.1 7.6
Total Operating Revenue 1,529.8 1,879.8 1,570.7
Operating Expenses      
Fuel, Purchased Power and Gas – Utility 477.6 482.9 545.5
Transmission Services – Utility 64.6 88.2 76.7
Cost of Sales – Non-utility 129.2 473.5 182.8
Operating and Maintenance 361.4 345.3 318.9
Depreciation and Amortization 271.5 251.8 242.2
Taxes Other than Income Taxes 65.4 57.2 70.4
Total Operating Expenses 1,369.7 1,698.9 1,436.5
Operating Income 160.1 180.9 134.2
Other Income (Expense)      
Interest Expense (81.7) (80.8) (75.2)
Equity Earnings 25.0 21.7 18.7
Other 23.0 85.0 22.4
Total Other Income (Expense) (33.7) 25.9 (34.1)
Income Before Non-Controlling Interest and Income Taxes 126.4 206.8 100.1
Income Tax Expense (Benefit) 4.7 27.9 (31.2)
Net Income 121.7 178.9 131.3
Net Loss Attributable to Non-Controlling Interest (57.6) (68.2) (58.0)
Net Income Attributable to ALLETE $ 179.3 $ 247.1 $ 189.3
Average Shares of Common Stock      
Basic (in shares) 57.7 57.3 55.9
Diluted (in shares) 57.8 57.4 56.0
Basic Earnings Per Share of Common Stock (in usd per share) $ 3.11 $ 4.31 $ 3.38
Diluted Earnings Per Share of Common Stock (in usd per share) $ 3.10 $ 4.30 $ 3.38