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Business Segment - Table (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 402.7 | $ 378.8 | $ 533.4 | $ 564.9 | $ 425.8 | $ 388.3 | $ 373.1 | $ 383.5 | $ 399.0 | $ 345.4 | $ 335.6 | $ 339.2 | $ 1,879.8 | $ 1,570.7 | $ 1,419.2
Other – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 5.1 | 7.6 | 11.4
Net Income Attributable to ALLETE | 51.5 | $ 85.9 | $ 51.5 | $ 58.2 | 51.7 | $ 33.7 | $ 37.6 | $ 66.3 | $ 61.9 | $ 27.6 | $ 27.9 | $ 51.8 | 247.1 | 189.3 | 169.2
Total Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |  | 251.8 | 242.2 | 231.7
Total Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  | 80.8 | 75.2 | 69.1
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 21.7 | 18.7 | 20.0
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  | 27.9 | (31.2) | (26.9)
Total Assets | 6,656.4 |  |  |  | 6,845.6 |  |  |  |  |  |  |  | 6,656.4 | 6,845.6 |
Total Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 256.0 | 208.1 |
New Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.7 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |  | 251.8 | 242.2 | 231.7
Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  | (6.4) | (4.8) | (2.9)
Regulated Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 1,238.3 | 1,259.3 | 1,227.9
Net Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  | 147.2 | 149.9 | 129.1
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 23.1 | 19.3 | 21.3
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  | 22.4 | (10.4) | (16.6)
Total Assets | 4,335.0 |  |  |  | 4,291.4 |  |  |  |  |  |  |  | 4,335.0 | 4,291.4 |
Total Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 236.3 | 158.3 |
Regulated Operations | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |  | 179.2 | 171.9 | 170.7
Total Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  | 63.9 | 58.1 | 57.3
ALLETE Clean Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 418.5 | 118.3 | 86.9
Net Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  | 71.7 | 16.3 | 26.3
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  | 2.7 | (15.4) | (16.6)
Total Assets | 1,594.1 |  |  |  | 1,873.3 |  |  |  |  |  |  |  | 1,594.1 | 1,873.3 |
Total Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  | (5.3) | 2.2 |
Gain From Legal Settlements - after-tax |  |  |  |  |  |  |  |  |  |  |  |  | 44.3 |  |
ALLETE Clean Energy | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |  | 57.5 | 58.6 | 49.2
Total Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  | 0.8 | 2.3 | 1.5
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 223.0 | 193.1 | 104.4
Net Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  | 28.2 | 23.1 | 13.8
Purchase price accounting - after tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.3 |
Total Assets | $ 727.3 |  |  |  | $ 680.9 |  |  |  |  |  |  |  | 727.3 | 680.9 |
Total Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 25.0 | 47.6 |
Corporate and Other | New Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.7 |
Corporate and Other | Nemadji Trail Energy Center | South Shore Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale after tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.5 |
Corporate and Other | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |  | 15.1 | 11.7 | 11.8
Corporate and Other | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  | 22.5 | 19.6 | 13.2
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  | (1.4) | (0.6) | (1.3)
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  | 2.8 | (5.4) | 6.3
Residential | Regulated Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 165.7 | 175.9 | 160.8
Commercial | Regulated Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 184.6 | 187.2 | 168.6
Municipal | Regulated Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 33.4 | 40.2 | 52.0
Industrial | Regulated Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 593.6 | 589.0 | 565.5
Other Power Suppliers | Regulated Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 146.1 | 165.8 | 168.7
Other | Regulated Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 114.9 | 101.2 | 112.3
Long-term PSA | ALLETE Clean Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 65.0 | 77.2 | 75.5
Sale of Wind Energy Facilities | ALLETE Clean Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 348.4 | 33.5 | 0.0
Other | ALLETE Clean Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  | 5.1 | 7.6 | 11.4
Long-term Contract | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 101.2 | 89.2 | 84.4
Sale of Renewable Development Projects | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 92.5 | 73.9 | 0.0
Other | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ 29.3 | $ 30.0 | $ 20.0

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