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CONSOLIDATED STATEMENT OF INCOME Unaudited - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Operating Revenue        
Contracts with Customers – Utility $ 310.5 $ 314.3 $ 928.6 $ 919.1
Contracts with Customers – Non-utility 95.4 63.2 232.6 554.1
Other – Non-utility 1.3 1.3 3.8 3.9
Total Operating Revenue 407.2 378.8 1,165.0 1,477.1
Operating Expenses        
Fuel, Purchased Power and Gas – Utility 116.5 124.9 357.3 350.8
Transmission Services – Utility 19.6 22.7 43.9 66.3
Cost of Sales – Non-utility 47.0 33.0 103.2 436.7
Operating and Maintenance 92.7 83.6 286.5 254.2
Depreciation and Amortization 70.8 63.1 201.8 188.2
Taxes Other than Income Taxes 15.3 15.5 50.3 43.1
Total Operating Expenses 361.9 342.8 1,043.0 1,339.3
Operating Income 45.3 36.0 122.0 137.8
Other Income (Expense)        
Interest Expense (20.3) (20.5) (60.8) (60.9)
Equity Earnings 5.1 4.7 16.5 16.1
Other 5.5 68.7 20.0 75.3
Total Other Income (Expense) (9.7) 52.9 (24.3) 30.5
Income Before Income Taxes 35.6 88.9 97.7 168.3
Income Tax Expense 2.9 19.3 8.3 20.4
Net Income 32.7 69.6 89.4 147.9
Net Loss Attributable to Non-Controlling Interest (12.3) (16.3) (39.3) (47.7)
Net Income Attributable to ALLETE $ 45.0 $ 85.9 $ 128.7 $ 195.6
Average Shares of Common Stock        
Basic (in shares) 57.8 57.4 57.7 57.3
Diluted (in shares) 57.9 57.5 57.8 57.4
Basic Earnings Per Share of Common Stock (in usd per share) $ 0.78 $ 1.50 $ 2.23 $ 3.41
Diluted Earnings Per Share of Common Stock (in usd per share) $ 0.78 $ 1.49 $ 2.23 $ 3.41