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Consolidated Statement of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating Revenues [Abstract]    
Contracts with Customers - Utility $ 312.6 $ 329.0
Contracts with Customers - Non-utility 251.0 51.7
Other - Non-utility 1.3 2.8
Total Operating Revenue 564.9 383.5
Operating Expenses [Abstract]    
Fuel, Purchased Power and Gas - Utility 118.6 137.4
Transmission Services - Utility 20.1 19.9
Cost of Sales - Non-utility 210.5 17.0
Operating and Maintenance 85.7 75.3
Depreciation and Amortization 62.3 61.7
Taxes Other than Income Taxes 19.4 18.8
Total Operating Expenses 516.6 330.1
Operating Income 48.3 53.4
Other Income (Expense) [Abstract]    
Interest Expense (19.3) (18.3)
Equity Earnings 6.0 5.5
Other 4.1 2.0
Total Other Expense (9.2) (10.8)
Income Before Income Taxes 39.1 42.6
Income Tax Benefit 1.5 (3.9)
Net Income 37.6 46.5
Net Loss Attributable to Non-Controlling Interest (20.6) (19.8)
Net Income Attributable to ALLETE $ 58.2 $ 66.3
Earnings Per Share [Abstract]    
Basic (Shares) 57.3 53.3
Diluted (Shares) 57.3 53.3
Basic Earnings Per Share of Common Stock $ 1.02 $ 1.24
Diluted Earnings Per Share of Common Stock $ 1.02 $ 1.24