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Business Segment (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2021 USD ($) | Dec. 31, 2021 USD ($) a | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) a | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 3 |
Revenue |  |  | $ 399.0 | $ 345.4 | $ 335.6 | $ 339.2 | $ 320.4 | $ 293.9 | $ 243.2 | $ 311.6 | $ 304.6 | $ 288.3 | $ 290.4 | $ 357.2 | $ 1,419.2 | $ 1,169.1 | $ 1,240.5
Other – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.4 | 11.3 | 11.6
Net Income Attributable to ALLETE |  |  | 61.9 | $ 27.6 | $ 27.9 | $ 51.8 | 47.1 | $ 40.7 | $ 20.1 | $ 66.3 | $ 49.7 | $ 31.2 | $ 34.2 | $ 70.5 | 169.2 | 174.2 | 185.6
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 231.7 | 217.8 | 202.0
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69.1 | 65.6 | 64.9
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.0 | 22.1 | 21.7
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (26.9) | (39.5) | (6.6)
Assets |  |  | 6,435.0 |  |  |  | 6,084.6 |  |  |  |  |  |  |  | 6,435.0 | 6,084.6 |
Property, Plant and Equipment, Additions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 476.4 | 657.2 |
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (2.9) | (8.3) | (5.0)
Regulated Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 170.7 | 166.9 | 159.4
Interest Expense | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | 57.3 | 58.5 | 58.9
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21.3 | 22.3 | 21.7
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16.6) | (19.4) | (7.1)
Property, Plant and Equipment, Additions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 166.8 | 133.7 |
Regulated Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,227.9 | 987.3 | 1,042.4
Net Income Attributable to ALLETE | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  | 129.1 | 136.3 | 154.4
Assets |  |  | $ 4,289.4 |  |  |  | 4,196.8 |  |  |  |  |  |  |  | $ 4,289.4 | 4,196.8 |
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Land in Minnesota (Acres) | a |  |  | 4,000 |  |  |  |  |  |  |  |  |  |  |  | 4,000 |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 104.4 | 102.2 | 105.1
Net Income Attributable to ALLETE | [2],[3],[4] |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.8 | 8.0 | 19.9
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.8 | 13.0 | 13.5
Interest Expense | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.2 | 13.2 | 8.0
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1.3) | (0.2) | 0.0
Income Tax Expense (Benefit) | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.3 | (1.0) | 12.8
Assets |  |  | $ 426.2 |  |  |  | 404.5 |  |  |  |  |  |  |  | 426.2 | 404.5 |
Property, Plant and Equipment, Additions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39.7 | 15.7 |
Gain on Sale of Affiliate, After-tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.2 |  |
Income Tax Expense (Benefit), Due to Sale of Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.4 |  |
Corporate and Other [Member] | Nemadji Trail Energy Center [Member] | South Shore Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale After Tax |  | $ 8.5 |  |  |  |  |  |  |  |  |  |  |  |  | 8.5 |  |
ALLETE Clean Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 86.9 | 79.6 | 59.6
Net Income Attributable to ALLETE | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  | 26.3 | 29.9 | 12.4
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.2 | 37.9 | 26.8
Interest Expense | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.5 | 2.2 | 2.8
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16.6) | (19.1) | (11.9)
Assets |  |  | $ 1,719.4 |  |  |  | $ 1,483.3 |  |  |  |  |  |  |  | 1,719.4 | 1,483.3 |
Property, Plant and Equipment, Additions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 269.9 | 507.8 |
U.S. Water Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 33.4
Net Income Attributable to ALLETE | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (1.1)
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 2.3
Interest Expense | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.2
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.4)
Residential [Member] | Regulated Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160.8 | 140.7 | 139.6
Commercial [Member] | Regulated Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 168.6 | 139.5 | 145.7
Municipal [Member] | Regulated Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 52.0 | 41.2 | 48.6
Industrial [Member] | Regulated Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 565.5 | 432.8 | 476.4
Other Power Suppliers [Member] | Regulated Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 168.7 | 138.8 | 153.7
CIP Financial Incentive [Member] | Regulated Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.4 | 2.4 | 2.8
Other [Member] | Regulated Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109.9 | 91.9 | 75.6
Long-term PSA [Member] | ALLETE Clean Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.5 | 68.3 | 48.0
ALLETE Clean Energy Other [Member] | ALLETE Clean Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other – Non-utility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.4 | 11.3 | 11.6
Point-in-Time [Member] | U.S. Water Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 19.0
Contract [Member] | U.S. Water Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 9.2
Capital Project [Member] | U.S. Water Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 5.2
Long-term Contract [Member] | Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 84.4 | 86.0 | 82.8
Corporate & Other - Other [Member] | Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.0 | $ 16.2 | $ 22.3
[1] | Includes interest expense resulting from intercompany loan agreements and allocated to certain subsidiaries. The amounts are eliminated in consolidation.
[2] | Includes interest expense resulting from intercompany loan agreements and allocated to certain subsidiaries. The amounts are eliminated in consolidation.
[3] | In 2019, ALLETE sold U.S. Water Services. The Company recognized a gain on the sale of $13.2 million after-tax which is reflected in Corporate and Other. (See Note 1. Operations and Significant Accounting Policies.)
[4] | In 2021, South Shore Energy sold a portion of its undivided ownership interest in NTEC to Basin. The closing of the transaction resulted in the recognition of an approximately $8.5 million after-tax gain which is reflected in Corporate and Other. (See Note 1. Operations and Significant Accounting Policies.)
[5] | In 2019, ALLETE sold U.S. Water Services. The Company recognized income tax expense of $10.4 million for the gain on sale of U.S. Water Services which is reflected in Corporate and Other. (See Note 1. Operations and Significant Accounting Policies.)
[6] | See Note 4. Regulatory Matters.

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