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Consolidated Statement of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating Revenues [Abstract]    
Contracts with Customers - Utility $ 293.0 $ 265.3
Contracts with Customers - Non-utility 43.4 43.5
Other - Non-utility 2.8 2.8
Total Operating Revenue 339.2 311.6
Operating Expenses [Abstract]    
Fuel, Purchased Power and Gas - Utility 120.4 89.0
Transmission Services - Utility 17.7 18.5
Cost of Sales - Non-utility 16.8 16.9
Operating and Maintenance 66.3 61.0
Depreciation and Amortization 58.0 53.4
Taxes Other than Income Taxes 18.0 12.6
Total Operating Expenses 297.2 251.4
Operating Income 42.0 60.2
Other Income (Expense) [Abstract]    
Interest Expense (17.1) (15.7)
Equity Earnings 4.8 5.2
Other 3.3 1.0
Total Other Expense (9.0) (9.5)
Income Before Income Taxes 33.0 50.7
Income Tax Benefit (10.4) (13.8)
Net Income 43.4 64.5
Net Loss Attributable to Non-Controlling Interest (8.4) (1.8)
Net Income Attributable to ALLETE $ 51.8 $ 66.3
Earnings Per Share [Abstract]    
Basic (Shares) 52.1 51.7
Diluted (Shares) 52.2 51.8
Basic Earnings Per Share of Common Stock $ 0.99 $ 1.28
Diluted Earnings Per Share of Common Stock $ 0.99 $ 1.28