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Consolidated Statement of Income Unaudited - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating Revenue    
Contracts with Customers – Utility $ 338.3 $ 312.6
Contracts with Customers – Non-utility 63.7 251.0
Other – Non-utility 1.3 1.3
Total Operating Revenue 403.3 564.9
Operating Expenses    
Fuel, Purchased Power and Gas – Utility 133.5 118.6
Transmission Services – Utility 22.7 20.1
Cost of Sales – Non-utility 24.4 210.5
Operating and Maintenance 91.7 85.7
Depreciation and Amortization 65.0 62.3
Taxes Other than Income Taxes 18.7 19.4
Total Operating Expenses 356.0 516.6
Operating Income 47.3 48.3
Other Income (Expense)    
Interest Expense (20.4) (19.3)
Equity Earnings 5.5 6.0
Other 8.6 4.1
Total Other Expense (6.3) (9.2)
Income Before Income Taxes 41.0 39.1
Income Tax Expense 4.0 1.5
Net Income 37.0 37.6
Net Loss Attributable to Non-Controlling Interest (13.7) (20.6)
Net Income Attributable to ALLETE $ 50.7 $ 58.2
Earnings Per Share [Abstract]    
Basic (in shares) 57.6 57.3
Diluted (in shares) 57.7 57.3
Basic Earnings Per Share of Common Stock (in usd per share) $ 0.88 $ 1.02
Diluted Earnings Per Share of Common Stock (in usd per share) $ 0.88 $ 1.02