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BUSINESS SEGMENTS - By Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Contracts with Customers – Utility $ 305.1 $ 279.8 $ 637.9 $ 618.1  
Contracts with Customers – Non-utility 53.8 73.5 119.7 137.2  
Other – Non-utility 1.4 1.2 2.9 2.5  
Total Operating Revenue 360.3 354.5 760.5 757.8  
Transmission Services – Utility 19.3 1.6 38.3 24.3  
Cost of Sales – Non-utility 24.3 31.8 49.2 56.2  
Operating and Maintenance 96.6 102.1 189.6 193.8  
Depreciation and Amortization 73.2 66.0 142.9 131.0  
Taxes Other than Income Taxes 15.6 16.3 33.2 35.0  
Net Income Attributable to ALLETE 31.9 33.0 88.0 83.7  
Interest Expense (23.1) (20.1) (44.5) (40.5)  
Equity Earnings 5.9 5.9 11.9 11.4  
Income Tax Expense (Benefit) (0.6) 1.4 6.9 5.4  
Assets 6,913.2 6,661.3 6,913.2 6,661.3 $ 6,754.3
Equity Investment 350.5 336.0 350.5 336.0 $ 340.1
Capital Expenditures 130.5 91.9 275.7 143.7  
Operating Segments          
Segment Reporting Information [Line Items]          
Contracts with Customers – Utility 305.1 279.8 637.9 618.1  
Contracts with Customers – Non-utility 28.5 42.9 64.9 77.7  
Other – Non-utility 1.4 1.2 2.9 2.5  
Total Operating Revenue 335.0 323.9 705.7 698.3  
Fuel, Purchased Power and Gas – Utility 114.1 108.0 237.4 241.7  
Transmission Services – Utility 19.3 1.6 38.3 24.3  
Cost of Sales – Non-utility 8.3 11.3 13.6 17.0  
Operating and Maintenance 89.3 84.3 177.2 171.1  
Depreciation and Amortization 69.1 62.0 134.9 123.0  
Taxes Other than Income Taxes 15.1 15.6 32.1 33.9  
Other Segment Items 8.8 2.7 11.4 8.5  
Net Income Attributable to ALLETE 28.6 43.8 83.6 95.8  
Interest Expense (18.3) (16.9) (36.1) (34.8)  
Equity Earnings 6.4 6.0 12.9 11.7  
Income Tax Expense (Benefit) 4.4 2.9 11.2 3.8  
Assets 6,467.2 6,288.1 6,467.2 6,288.1  
Equity Investment 206.9 186.7 206.9 186.7  
Capital Expenditures 128.3 87.0 272.1 136.7  
Corporate and Other          
Segment Reporting Information [Line Items]          
Contracts with Customers – Utility 0.0 0.0 0.0 0.0  
Contracts with Customers – Non-utility 25.3 30.6 54.8 59.5  
Other – Non-utility 0.0 0.0 0.0 0.0  
Total Operating Revenue 25.3 30.6 54.8 59.5  
Depreciation and Amortization 4.1 4.0 8.0 8.0  
Net Income Attributable to ALLETE 3.3 (10.8) 4.4 (12.1)  
Interest Expense (4.8) (3.2) (8.4) (5.7)  
Equity Earnings (0.5) (0.1) (1.0) (0.3)  
Income Tax Expense (Benefit) (5.0) (1.5) (4.3) 1.6  
Assets 446.0 373.2 446.0 373.2  
Equity Investment 143.6 149.3 143.6 149.3  
Capital Expenditures 2.2 4.9 3.6 7.0  
Regulated Operations          
Segment Reporting Information [Line Items]          
Total Operating Revenue 305.1 279.8 637.9 618.1  
Net Income Attributable to ALLETE 23.0 33.7 61.4 77.9  
Regulated Operations | Operating Segments          
Segment Reporting Information [Line Items]          
Contracts with Customers – Utility 305.1 279.8 637.9 618.1  
Contracts with Customers – Non-utility 0.0 0.0 0.0 0.0  
Other – Non-utility 0.0 0.0 0.0 0.0  
Total Operating Revenue 305.1 279.8 637.9 618.1  
Fuel, Purchased Power and Gas – Utility 114.1 108.0 237.4 241.7  
Transmission Services – Utility 19.3 1.6 38.3 24.3  
Cost of Sales – Non-utility 0.0 0.0 0.0 0.0  
Operating and Maintenance 68.6 66.7 137.3 133.5  
Depreciation and Amortization 54.1 46.8 104.8 93.2  
Taxes Other than Income Taxes 12.3 13.7 26.6 29.4  
Other Segment Items (13.7) (9.3) (32.1) (18.1)  
Net Income Attributable to ALLETE 23.0 33.7 61.4 77.9  
Interest Expense (17.4) (16.3) (34.5) (32.3)  
Equity Earnings 6.4 6.0 12.9 11.7  
Income Tax Expense (Benefit) 5.2 3.8 15.4 8.7  
Assets 4,633.4 4,404.2 4,633.4 4,404.2  
Equity Investment 206.9 186.7 206.9 186.7  
Capital Expenditures 117.5 80.5 251.8 130.0  
ALLETE Clean Energy          
Segment Reporting Information [Line Items]          
Total Operating Revenue 15.3 15.7 31.8 34.8  
Net Income Attributable to ALLETE 0.9 2.4 8.3 6.2  
ALLETE Clean Energy | Operating Segments          
Segment Reporting Information [Line Items]          
Contracts with Customers – Utility 0.0 0.0 0.0 0.0  
Contracts with Customers – Non-utility 13.9 14.5 28.9 32.3  
Other – Non-utility 1.4 1.2 2.9 2.5  
Total Operating Revenue 15.3 15.7 31.8 34.8  
Fuel, Purchased Power and Gas – Utility 0.0 0.0 0.0 0.0  
Transmission Services – Utility 0.0 0.0 0.0 0.0  
Cost of Sales – Non-utility 0.0 0.0 0.0 0.0  
Operating and Maintenance 13.8 11.7 27.7 25.2  
Depreciation and Amortization 14.6 14.7 29.0 28.8  
Taxes Other than Income Taxes 2.8 1.9 5.5 4.5  
Other Segment Items 16.8 15.0 38.7 29.9  
Net Income Attributable to ALLETE 0.9 2.4 8.3 6.2  
Interest Expense 0.0 (0.1) 0.0 (0.2)  
Equity Earnings 0.0 0.0 0.0 0.0  
Income Tax Expense (Benefit) (1.7) (3.0) (5.2) (8.5)  
Assets 1,456.8 1,577.7 1,456.8 1,577.7  
Equity Investment 0.0 0.0 0.0 0.0  
Capital Expenditures 2.1 1.4 4.2 1.6  
New Energy          
Segment Reporting Information [Line Items]          
Total Operating Revenue 14.6 28.4 36.0 45.4  
Net Income Attributable to ALLETE 4.7 7.7 13.9 11.7  
New Energy | Operating Segments          
Segment Reporting Information [Line Items]          
Contracts with Customers – Utility 0.0 0.0 0.0 0.0  
Contracts with Customers – Non-utility 14.6 28.4 36.0 45.4  
Other – Non-utility 0.0 0.0 0.0 0.0  
Total Operating Revenue 14.6 28.4 36.0 45.4  
Fuel, Purchased Power and Gas – Utility 0.0 0.0 0.0 0.0  
Transmission Services – Utility 0.0 0.0 0.0 0.0  
Cost of Sales – Non-utility 8.3 11.3 13.6 17.0  
Operating and Maintenance 6.9 5.9 12.2 12.4  
Depreciation and Amortization 0.4 0.5 1.1 1.0  
Taxes Other than Income Taxes 0.0 0.0 0.0 0.0  
Other Segment Items 5.7 (3.0) 4.8 (3.3)  
Net Income Attributable to ALLETE 4.7 7.7 13.9 11.7  
Interest Expense (0.9) (0.5) (1.6) (2.3)  
Equity Earnings 0.0 0.0 0.0 0.0  
Income Tax Expense (Benefit) 0.9 2.1 1.0 3.6  
Assets 377.0 306.2 377.0 306.2  
Equity Investment 0.0 0.0 0.0 0.0  
Capital Expenditures $ 8.7 $ 5.1 $ 16.1 $ 5.1