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BUSINESS SEGMENTS - By Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Contracts with Customers – Utility $ 332.8 $ 338.3  
Contracts with Customers – Non-utility 65.9 63.7  
Other – Non-utility 1.5 1.3  
Total Operating Revenue 400.2 403.3  
Transmission Services – Utility 19.0 22.7  
Cost of Sales – Non-utility 24.9 24.4  
Operating and Maintenance 93.0 91.7  
Depreciation and Amortization 69.7 65.0  
Taxes Other than Income Taxes 17.6 18.7  
Net Income Attributable to ALLETE 56.1 50.7  
Interest Expense (21.4) (20.4)  
Equity Earnings 6.0 5.5  
Income Tax Expense (Benefit) 7.5 4.0  
Assets 6,866.3 6,604.6 $ 6,754.3
Equity Investment 344.0 333.1 340.1
Capital Expenditures 145.2 51.8  
Operating Segments      
Segment Reporting Information [Line Items]      
Contracts with Customers – Utility 332.8 338.3  
Contracts with Customers – Non-utility 36.4 34.8  
Other – Non-utility 1.5 1.3  
Total Operating Revenue 370.7 374.4  
Fuel, Purchased Power and Gas – Utility 123.3 133.7  
Transmission Services – Utility 19.0 22.7  
Cost of Sales – Non-utility 5.3 5.7  
Operating and Maintenance 87.9 86.8  
Depreciation and Amortization 65.8 61.0  
Taxes Other than Income Taxes 17.0 18.3  
Other Segment Items 2.6 5.8  
Net Income Attributable to ALLETE 55.0 52.0  
Interest Expense (17.8) (17.9)  
Equity Earnings 6.5 5.7  
Income Tax Expense (Benefit) 6.8 0.9  
Assets 6,375.8 6,221.0  
Equity Investment 199.5 182.7  
Capital Expenditures 143.8 49.7  
Corporate and Other      
Segment Reporting Information [Line Items]      
Contracts with Customers – Utility 0.0 0.0  
Contracts with Customers – Non-utility 29.5 28.9  
Other – Non-utility 0.0 0.0  
Total Operating Revenue 29.5 28.9  
Depreciation and Amortization 3.9 4.0  
Net Income Attributable to ALLETE 1.1 (1.3)  
Interest Expense (3.6) (2.5)  
Equity Earnings (0.5) (0.2)  
Income Tax Expense (Benefit) 0.7 3.1  
Assets 490.5 383.6  
Equity Investment 144.5 150.4  
Capital Expenditures 1.4 2.1  
Regulated Operations      
Segment Reporting Information [Line Items]      
Total Operating Revenue 332.8 338.3  
Net Income Attributable to ALLETE 38.4 44.2  
Assets 4,560.2   4,489.4
Regulated Operations | Operating Segments      
Segment Reporting Information [Line Items]      
Contracts with Customers – Utility 332.8 338.3  
Contracts with Customers – Non-utility 0.0 0.0  
Other – Non-utility 0.0 0.0  
Total Operating Revenue 332.8 338.3  
Fuel, Purchased Power and Gas – Utility 123.3 133.7  
Transmission Services – Utility 19.0 22.7  
Cost of Sales – Non-utility 0.0 0.0  
Operating and Maintenance 68.7 66.8  
Depreciation and Amortization 50.7 46.4  
Taxes Other than Income Taxes 14.3 15.7  
Other Segment Items (18.4) (8.8)  
Net Income Attributable to ALLETE 38.4 44.2  
Interest Expense (17.1) (16.0)  
Equity Earnings 6.5 5.7  
Income Tax Expense (Benefit) 10.2 4.9  
Assets 4,560.2 4,345.1  
Equity Investment 199.5 182.7  
Capital Expenditures 134.3 49.5  
ALLETE Clean Energy      
Segment Reporting Information [Line Items]      
Total Operating Revenue 16.5 19.1  
Net Income Attributable to ALLETE 7.4 3.8  
Assets 1,464.2   1,477.4
ALLETE Clean Energy | Operating Segments      
Segment Reporting Information [Line Items]      
Contracts with Customers – Utility 0.0 0.0  
Contracts with Customers – Non-utility 15.0 17.8  
Other – Non-utility 1.5 1.3  
Total Operating Revenue 16.5 19.1  
Fuel, Purchased Power and Gas – Utility 0.0 0.0  
Transmission Services – Utility 0.0 0.0  
Cost of Sales – Non-utility 0.0 0.0  
Operating and Maintenance 13.9 13.5  
Depreciation and Amortization 14.4 14.1  
Taxes Other than Income Taxes 2.7 2.6  
Other Segment Items 21.9 14.9  
Net Income Attributable to ALLETE 7.4 3.8  
Interest Expense 0.0 (0.1)  
Equity Earnings 0.0 0.0  
Income Tax Expense (Benefit) (3.5) (5.5)  
Assets 1,464.2 1,580.0  
Equity Investment 0.0 0.0  
Capital Expenditures 2.1 0.2  
New Energy      
Segment Reporting Information [Line Items]      
Total Operating Revenue 21.4 17.0  
Net Income Attributable to ALLETE 9.2 4.0  
Assets 351.4   $ 335.7
New Energy | Operating Segments      
Segment Reporting Information [Line Items]      
Contracts with Customers – Utility 0.0 0.0  
Contracts with Customers – Non-utility 21.4 17.0  
Other – Non-utility 0.0 0.0  
Total Operating Revenue 21.4 17.0  
Fuel, Purchased Power and Gas – Utility 0.0 0.0  
Transmission Services – Utility 0.0 0.0  
Cost of Sales – Non-utility 5.3 5.7  
Operating and Maintenance 5.3 6.5  
Depreciation and Amortization 0.7 0.5  
Taxes Other than Income Taxes 0.0 0.0  
Other Segment Items (0.9) (0.3)  
Net Income Attributable to ALLETE 9.2 4.0  
Interest Expense (0.7) (1.8)  
Equity Earnings 0.0 0.0  
Income Tax Expense (Benefit) 0.1 1.5  
Assets 351.4 295.9  
Equity Investment 0.0 0.0  
Capital Expenditures $ 7.4 $ 0.0