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Business Segment - By Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contracts with Customers – Utility |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,242.7 | $ 1,238.3 | $ 1,259.3
Contracts with Customers – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 282.1 | 636.4 | 303.8
Other – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 5.0 | 5.1 | 7.6
Total Operating Revenue | $ 364.8 | $ 407.2 | $ 354.5 | $ 403.3 | $ 402.7 | $ 378.8 | $ 533.4 | $ 564.9 | $ 425.8 | $ 388.3 | $ 373.1 | $ 383.5 | 1,529.8 | 1,879.8 | 1,570.7
Fuel, Purchased Power and Gas – Utility |  |  |  |  |  |  |  |  |  |  |  |  | 477.6 | 482.9 | 545.5
Transmission Services – Utility |  |  |  |  |  |  |  |  |  |  |  |  | 64.6 | 88.2 | 76.7
Cost of Sales – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 129.2 | 473.5 | 182.8
Operating and Maintenance |  |  |  |  |  |  |  |  |  |  |  |  | 361.4 | 345.3 | 318.9
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |  | 271.5 | 251.8 | 242.2
Taxes Other than Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  | 65.4 | 57.2 | 70.4
Net Income Attributable to ALLETE | 50.6 | $ 45.0 | $ 33.0 | $ 50.7 | 51.5 | $ 85.9 | $ 51.5 | $ 58.2 | 51.7 | $ 33.7 | $ 37.6 | $ 66.3 | 179.3 | 247.1 | 189.3
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  | (81.7) | (80.8) | (75.2)
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 25.0 | 21.7 | 18.7
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  |  |  |  |  | (4.7) | (27.9) | 31.2
Assets | 6,754.3 |  |  |  | 6,656.4 |  |  |  | 6,845.6 |  |  |  | 6,754.3 | 6,656.4 | 6,845.6
Equity Investment | 340.1 |  |  |  | 331.2 |  |  |  | 322.7 |  |  |  | 340.1 | 331.2 | 322.7
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 348.0 | 256.0 | 208.1
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contracts with Customers – Utility |  |  |  |  |  |  |  |  |  |  |  |  | 1,242.7 | 1,238.3 | 1,259.3
Contracts with Customers – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 79.3 | 413.4 | 110.7
Other – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 5.0 | 5.1 | 7.6
Total Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 1,327.0 | 1,656.8 | 1,377.6
Fuel, Purchased Power and Gas – Utility |  |  |  |  |  |  |  |  |  |  |  |  | 479.7 | 484.3 | 545.5
Transmission Services – Utility |  |  |  |  |  |  |  |  |  |  |  |  | 64.6 | 88.2 | 76.7
Cost of Sales – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 18.3 | 342.2 | 56.7
Operating and Maintenance |  |  |  |  |  |  |  |  |  |  |  |  | 296.5 | 299.2 | 286.6
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |  | 253.8 | 236.7 | 230.5
Taxes Other than Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  | 62.9 | 54.5 | 68.1
Other Segment Items |  |  |  |  |  |  |  |  |  |  |  |  | 27.5 | 67.2 | 52.7
Net Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  | 178.7 | 218.9 | 166.2
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  | (66.4) | (64.7) | (60.4)
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 26.5 | 23.1 | 19.3
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  |  |  |  |  | (2.0) | (25.1) | 25.8
Assets | 5,966.8 |  |  |  | 5,929.1 |  |  |  | 6,164.7 |  |  |  | 5,966.8 | 5,929.1 | 6,164.7
Equity Investment | 194.4 |  |  |  | 179.7 |  |  |  | 165.4 |  |  |  | 194.4 | 179.7 | 165.4
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 294.9 | 231.0 | 160.5
Regulated Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 1,242.7 | 1,238.3 | 1,259.3
Net Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  | 160.9 | 147.2 | 149.9
Regulated Operations | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contracts with Customers – Utility |  |  |  |  |  |  |  |  |  |  |  |  | 1,242.7 | 1,238.3 | 1,259.3
Contracts with Customers – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 1,242.7 | 1,238.3 | 1,259.3
Fuel, Purchased Power and Gas – Utility |  |  |  |  |  |  |  |  |  |  |  |  | 479.7 | 484.3 | 545.5
Transmission Services – Utility |  |  |  |  |  |  |  |  |  |  |  |  | 64.6 | 88.2 | 76.7
Cost of Sales – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Operating and Maintenance |  |  |  |  |  |  |  |  |  |  |  |  | 250.0 | 247.1 | 239.3
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |  | 196.3 | 179.2 | 171.9
Taxes Other than Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  | 52.5 | 44.5 | 57.4
Other Segment Items |  |  |  |  |  |  |  |  |  |  |  |  | (38.7) | (47.8) | (18.6)
Net Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  | 160.9 | 147.2 | 149.9
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  | (66.1) | (63.9) | (58.1)
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 26.5 | 23.1 | 19.3
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  |  |  |  |  | (17.6) | (22.4) | 10.4
Assets | 4,489.4 |  |  |  | 4,335.0 |  |  |  | 4,291.4 |  |  |  | 4,489.4 | 4,335.0 | 4,291.4
Equity Investment | 194.4 |  |  |  | 179.7 |  |  |  | 165.4 |  |  |  | 194.4 | 179.7 | 165.4
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 287.2 | 236.3 | 158.3
ALLETE Clean Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 84.3 | 418.5 | 118.3
Net Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  | 17.8 | 71.7 | 16.3
ALLETE Clean Energy | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contracts with Customers – Utility |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Contracts with Customers – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 79.3 | 413.4 | 110.7
Other – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 5.0 | 5.1 | 7.6
Total Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 84.3 | 418.5 | 118.3
Fuel, Purchased Power and Gas – Utility |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Transmission Services – Utility |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Cost of Sales – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 18.3 | 342.2 | 56.7
Operating and Maintenance |  |  |  |  |  |  |  |  |  |  |  |  | 46.5 | 52.1 | 47.3
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |  | 57.5 | 57.5 | 58.6
Taxes Other than Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  | 10.4 | 10.0 | 10.7
Other Segment Items |  |  |  |  |  |  |  |  |  |  |  |  | 66.2 | 115.0 | 71.3
Net Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  | 17.8 | 71.7 | 16.3
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  | (0.3) | (0.8) | (2.3)
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  |  |  |  |  | 15.6 | (2.7) | 15.4
Assets | 1,477.4 |  |  |  | 1,594.1 |  |  |  | 1,873.3 |  |  |  | 1,477.4 | 1,594.1 | 1,873.3
Equity Investment | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 7.7 | (5.3) | 2.2
Corporate and Other / Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 202.8 | 223.0 | 193.1
Net Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  | 0.6 | 28.2 | 23.1
Corporate and Other / Eliminations | Corporate and Other / Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contracts with Customers – Utility |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Contracts with Customers – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 202.8 | 223.0 | 193.1
Other – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 202.8 | 223.0 | 193.1
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |  | 17.7 | 15.1 | 11.7
Net Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  | 0.6 | 28.2 | 23.1
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  | (15.3) | (16.1) | (14.8)
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  | (1.5) | (1.4) | (0.6)
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  |  |  |  |  | (2.7) | (2.8) | 5.4
Assets | 787.5 |  |  |  | 727.3 |  |  |  | 680.9 |  |  |  | 787.5 | 727.3 | 680.9
Equity Investment | $ 145.7 |  |  |  | $ 151.5 |  |  |  | $ 157.3 |  |  |  | 145.7 | 151.5 | 157.3
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  | $ 53.1 | $ 25.0 | $ 47.6

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