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BUSINESS SEGMENTS - Business Segments (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
Business Segments [Line Items] |  |  |  |  |
Other | $ 1.4 | $ 1.2 | $ 2.9 | $ 2.5 |
Total Operating Revenue | 360.3 | 354.5 | 760.5 | 757.8 |
Net Income (Loss) Attributable to ALLETE | 31.9 | 33.0 | 88.0 | 83.7 |
Assets | 6,913.2 | 6,661.3 | 6,913.2 | 6,661.3 | $ 6,754.3
Operating Segments |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Other | 1.4 | 1.2 | 2.9 | 2.5 |
Total Operating Revenue | 335.0 | 323.9 | 705.7 | 698.3 |
Net Income (Loss) Attributable to ALLETE | 28.6 | 43.8 | 83.6 | 95.8 |
Assets | 6,467.2 | 6,288.1 | 6,467.2 | 6,288.1 |
Corporate and Other |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Other | 0.0 | 0.0 | 0.0 | 0.0 |
Total Operating Revenue | 25.3 | 30.6 | 54.8 | 59.5 |
Net Income (Loss) Attributable to ALLETE | 3.3 | (10.8) | 4.4 | (12.1) |
Assets | 446.0 | 373.2 | 446.0 | 373.2 |
Regulated Operations |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Total Operating Revenue | 305.1 | 279.8 | 637.9 | 618.1 |
Net Income (Loss) Attributable to ALLETE | 23.0 | 33.7 | 61.4 | 77.9 |
Regulated Operations | Operating Segments |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Other | 0.0 | 0.0 | 0.0 | 0.0 |
Total Operating Revenue | 305.1 | 279.8 | 637.9 | 618.1 |
Net Income (Loss) Attributable to ALLETE | 23.0 | 33.7 | 61.4 | 77.9 |
Assets | 4,633.4 | 4,404.2 | 4,633.4 | 4,404.2 |
Regulated Operations | Residential |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | 40.0 | 37.1 | 96.4 | 88.6 |
Regulated Operations | Commercial |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | 45.3 | 43.8 | 97.0 | 93.5 |
Regulated Operations | Municipal |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | 8.2 | 7.4 | 17.8 | 16.4 |
Regulated Operations | Industrial |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | 137.2 | 146.8 | 277.1 | 306.3 |
Regulated Operations | Other Power Suppliers |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | 47.3 | 30.4 | 94.4 | 70.4 |
Regulated Operations | Other |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | 27.1 | 14.3 | 55.2 | 42.9 |
ALLETE Clean Energy |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Total Operating Revenue | 15.3 | 15.7 | 31.8 | 34.8 |
Net Income (Loss) Attributable to ALLETE | 0.9 | 2.4 | 8.3 | 6.2 |
ALLETE Clean Energy | Operating Segments |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Other | 1.4 | 1.2 | 2.9 | 2.5 |
Total Operating Revenue | 15.3 | 15.7 | 31.8 | 34.8 |
Net Income (Loss) Attributable to ALLETE | 0.9 | 2.4 | 8.3 | 6.2 |
Assets | 1,456.8 | 1,577.7 | 1,456.8 | 1,577.7 |
ALLETE Clean Energy | Long-term PSA |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | 13.9 | 14.5 | 28.9 | 32.3 |
ALLETE Clean Energy | Other |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Other | 1.4 | 1.2 | 2.9 | 2.5 |
New Energy |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Total Operating Revenue | 14.6 | 28.4 | 36.0 | 45.4 |
Net Income (Loss) Attributable to ALLETE | 4.7 | 7.7 | 13.9 | 11.7 |
New Energy | Operating Segments |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Other | 0.0 | 0.0 | 0.0 | 0.0 |
Total Operating Revenue | 14.6 | 28.4 | 36.0 | 45.4 |
Net Income (Loss) Attributable to ALLETE | 4.7 | 7.7 | 13.9 | 11.7 |
Assets | 377.0 | 306.2 | 377.0 | 306.2 |
New Energy | Sale of Renewable Development Projects |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | 10.0 | 25.6 | 28.2 | 39.5 |
New Energy | Other |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | 4.6 | 2.8 | 7.8 | 5.9 |
Corporate and Other |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Total Operating Revenue | 25.3 | 30.6 | 54.8 | 59.5 |
Net Income (Loss) Attributable to ALLETE | 3.3 | (10.8) | 4.4 | (12.1) |
Corporate and Other | Long-term Contract |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | 22.4 | 27.3 | 48.5 | 52.7 |
Corporate and Other | Other |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | $ 2.9 | $ 3.3 | $ 6.3 | $ 6.8 |

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