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Equity Investments (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) MW | 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 ($) | Dec. 31, 2021 USD ($) MW | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
ALLETE's Investment in ATC [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investment Beginning Balance |  |  |  |  |  | $ 301.2 |  |  |  |  |  |  |  |  | $ 301.2 |  |
Cash Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.6 | $ 99.1 | $ 37.9
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.0 | 22.1 | 21.7
Equity Investment Ending Balance |  |  | $ 318.0 |  |  |  | $ 301.2 |  |  |  |  |  |  |  | 318.0 | 301.2 |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Current Assets |  |  | 291.3 |  |  |  | 254.9 |  |  |  |  |  |  |  | 291.3 | 254.9 |
Total Assets |  |  | 6,435.0 |  |  |  | 6,084.6 |  |  |  |  |  |  |  | 6,435.0 | 6,084.6 |
Liabilities and Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, Current |  |  | 543.4 |  |  |  | 459.6 |  |  |  |  |  |  |  | 543.4 | 459.6 |
Members' Equity |  |  | 2,946.3 |  |  |  | 2,800.2 |  |  |  | $ 2,335.6 |  |  |  | 2,946.3 | 2,800.2 | 2,335.6
Total Liabilities and Equity |  |  | 6,435.0 |  |  |  | 6,084.6 |  |  |  |  |  |  |  | 6,435.0 | 6,084.6 |
Income Statement Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Net Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 137.8 | 161.6 | 185.5
ALLETE's Equity in Net Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.0 | 22.1 | 21.7
ATC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approximate Refund for Reversal of FERC ROE Order |  |  | 65.0 |  |  |  |  |  |  |  |  |  |  |  | 65.0 |  |
Approximate Refund for Reversale of FERC ROE Order, ALLETE's Proportionate Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.0 |  |
Approximate Reduction in Pretax Income for FERC Proposal to Limit Incentive adder, ALLETE's Proportionate Share |  |  | $ 1.0 |  |  |  |  |  |  |  |  |  |  |  | $ 1.0 |  |
FERC Proposed Reduction to Incentive Adder |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |
ATC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |
Expected Additional Investment in 2022 |  |  | $ 6.0 |  |  |  |  |  |  |  |  |  |  |  | $ 6.0 |  |
ALLETE's Investment in ATC [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investment Beginning Balance |  |  |  |  |  | 149.0 |  |  |  | $ 141.6 |  |  |  |  | 149.0 | 141.6 |
Cash Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 2.7 |
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21.3 | 22.3 |
Distributed Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (17.2) | (18.9) |
Amortization from the Remeasurement of Deferred Income Taxes for Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.4 | 1.3 |
Equity Investment Ending Balance |  |  | $ 154.5 |  |  |  | 149.0 |  |  |  | $ 141.6 |  |  |  | 154.5 | 149.0 | 141.6
Income Statement Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ALLETE's Equity in Net Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.3 | 22.3 |
Authorized Return on Equity |  |  | 10.02% |  |  |  |  |  |  |  |  |  |  |  | 10.02% |  |
Authorized Return on Equity, Including Incentive Adder |  |  | 10.52% |  |  |  |  |  |  |  |  |  |  |  | 10.52% |  |
ATC [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ALLETE's Investment in ATC [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.3 | 22.3 | 21.7
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Current Assets |  |  | $ 89.8 |  |  |  | 92.8 |  |  |  |  |  |  |  | 89.8 | 92.8 |
Assets, Noncurrent |  |  | 5,628.1 |  |  |  | 5,400.5 |  |  |  |  |  |  |  | 5,628.1 | 5,400.5 |
Total Assets |  |  | 5,717.9 |  |  |  | 5,493.3 |  |  |  |  |  |  |  | 5,717.9 | 5,493.3 |
Liabilities and Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, Current |  |  | 436.9 |  |  |  | 310.8 |  |  |  |  |  |  |  | 436.9 | 310.8 |
Long-Term Debt |  |  | 2,513.0 |  |  |  | 2,512.2 |  |  |  |  |  |  |  | 2,513.0 | 2,512.2 |
Other Non-Current Liabilities |  |  | 422.0 |  |  |  | 378.2 |  |  |  |  |  |  |  | 422.0 | 378.2 |
Members' Equity |  |  | 2,346.0 |  |  |  | 2,292.1 |  |  |  |  |  |  |  | 2,346.0 | 2,292.1 |
Total Liabilities and Equity |  |  | $ 5,717.9 |  |  |  | 5,493.3 |  |  |  |  |  |  |  | 5,717.9 | 5,493.3 |
Income Statement Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 754.8 | 758.1 | 744.4
Operating Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 376.2 | 372.4 | 373.5
Other Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 113.9 | 110.9 | 110.5
Net Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 264.7 | 274.8 | 260.4
ALLETE's Equity in Net Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.3 | 22.3 | $ 21.7
ATC [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ALLETE's Investment in ATC [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Investments |  | $ 2.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nobles 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |
ALLETE's Investment in ATC [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investment Beginning Balance |  |  |  |  |  | $ 152.2 |  |  |  |  |  |  |  |  | $ 152.2 |  |
Cash Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.6 |  |
Equity Earnings | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | (1.3) |  |
Distributed Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5.0) |  |
Equity Investment Ending Balance |  |  | $ 163.5 |  |  |  | $ 152.2 |  |  |  |  |  |  |  | 163.5 | $ 152.2 |
Income Statement Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ALLETE's Equity in Net Income | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1.3) |  |
Tenaska [Member] | Nobles 2 PPA [Member] | Minnesota Power [Member] | Wind Turbine Generators [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generating Capacity Counterparty Owned (MW) | MW |  |  | 250 |  |  |  |  |  |  |  |  |  |  |  | 250 |  |
Contract Term (Years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |
[1] | The Company also recorded net loss attributable to non-controlling interest of $6.6 million related to its investment in Nobles 2

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