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Consolidated Statement of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Operating Revenues [Abstract]        
Contracts with Customers - Utility $ 308.7 $ 290.4 $ 637.7 $ 583.4
Contracts with Customers - Non-utility 62.1 42.3 113.8 85.7
Other - Non-utility 2.3 2.9 5.1 5.7
Total Operating Revenue 373.1 335.6 756.6 674.8
Operating Expenses [Abstract]        
Fuel, Purchased Power and Gas - Utility 143.2 128.9 280.6 249.3
Transmission Services - Utility 18.3 19.2 38.2 36.9
Cost of Sales - Non-utility 41.5 15.8 58.5 32.6
Operating and Maintenance 79.6 67.1 154.9 133.4
Depreciation and Amortization 61.0 57.9 122.7 115.9
Taxes Other than Income Taxes 15.8 18.5 34.6 36.5
Total Operating Expenses 359.4 307.4 689.5 604.6
Operating Income 13.7 28.2 67.1 70.2
Other Income (Expense) [Abstract]        
Interest Expense (18.6) (17.4) (36.9) (34.5)
Equity Earnings 5.3 5.1 10.8 9.9
Other 12.1 1.8 14.1 5.1
Total Other Expense (1.2) (10.5) (12.0) (19.5)
Income Before Income Taxes 12.5 17.7 55.1 50.7
Income Tax Benefit (8.3) (4.0) (12.2) (14.4)
Net Income 20.8 21.7 67.3 65.1
Net Loss Attributable to Non-Controlling Interest (16.8) (6.2) (36.6) (14.6)
Net Income Attributable to ALLETE $ 37.6 $ 27.9 $ 103.9 $ 79.7
Earnings Per Share [Abstract]        
Basic (Shares) 56.1 52.2 54.9 52.2
Diluted (Shares) 56.1 52.3 54.9 52.2
Basic Earnings Per Share of Common Stock $ 0.67 $ 0.53 $ 1.89 $ 1.53
Diluted Earnings Per Share of Common Stock $ 0.67 $ 0.53 $ 1.89 $ 1.53