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CONSOLIDATED STATEMENT OF INCOME Unaudited - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Operating Revenue        
Contracts with Customers – Utility $ 305.1 $ 279.8 $ 637.9 $ 618.1
Contracts with Customers – Non-utility 53.8 73.5 119.7 137.2
Other – Non-utility 1.4 1.2 2.9 2.5
Total Operating Revenue 360.3 354.5 760.5 757.8
Operating Expenses        
Fuel, Purchased Power and Gas – Utility 113.3 107.3 236.3 240.8
Transmission Services – Utility 19.3 1.6 38.3 24.3
Cost of Sales – Non-utility 24.3 31.8 49.2 56.2
Operating and Maintenance 96.6 102.1 189.6 193.8
Depreciation and Amortization 73.2 66.0 142.9 131.0
Taxes Other than Income Taxes 15.6 16.3 33.2 35.0
Total Operating Expenses 342.3 325.1 689.5 681.1
Operating Income 18.0 29.4 71.0 76.7
Other Income (Expense)        
Interest Expense (23.1) (20.1) (44.5) (40.5)
Equity Earnings 5.9 5.9 11.9 11.4
Other 5.2 5.9 9.8 14.5
Total Other Expense (12.0) (8.3) (22.8) (14.6)
Income Before Income Taxes 6.0 21.1 48.2 62.1
Income Tax Expense (Benefit) (0.6) 1.4 6.9 5.4
Net Income 6.6 19.7 41.3 56.7
Net Loss Attributable to Non-Controlling Interest (25.3) (13.3) (46.7) (27.0)
Net Income Attributable to ALLETE $ 31.9 $ 33.0 $ 88.0 $ 83.7
Average Shares of Common Stock        
Basic (in shares) 58.0 57.7 58.0 57.7
Diluted (in shares) 58.1 57.8 58.0 57.7
Basic Earnings Per Share of Common Stock (in usd per share) $ 0.55 $ 0.57 $ 1.52 $ 1.45
Diluted Earnings Per Share of Common Stock (in usd per share) $ 0.55 $ 0.57 $ 1.52 $ 1.45