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Operations and Significant Accounting Policies - Immaterial Revision of Prior Periods (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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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, 2020 | Sep. 30, 2020 | [1] | Jun. 30, 2020 | [1] | Mar. 31, 2020 | [1] | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge - After Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.8
Error Corrections and Prior Period Adjustments, Description |  |  |  |  |  |  |  |  |  |  |  |  |  | We have identified an immaterial prior period error with respect to the recognition of a non-cash impairment expense for our Northern Wind operating assets in the fourth quarter of 2020 prior to the execution of the purchase and sales agreement for a repower and sale of the wind energy facility. Specifically, the remaining net book value of the property, plant and equipment used in the recoverability test was calculated incorrectly. |  |
Loss on Impairment of Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | 12.7
Income Tax Benefit |  |  |  |  |  |  |  |  |  |  |  |  |  | (31.2) | (26.9) | (43.4)
Net Income Attributable to ALLETE | $ 51.7 | $ 33.7 | $ 37.6 | $ 66.3 | $ 61.9 | $ 27.6 | $ 27.9 | $ 51.8 | $ 38.3 | [1] | $ 40.7 | $ 20.1 | $ 66.3 | 189.3 | 169.2 | 165.4
Comprehensive Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 188.7 | $ 176.5 | $ 157.9
Earnings Per Share | $ 0.90 | $ 0.59 | $ 0.67 | $ 1.24 | $ 1.18 | $ 0.53 | $ 0.53 | $ 0.99 | $ 0.73 | [1] | $ 0.78 | $ 0.39 | $ 1.28 | $ 3.38 | $ 3.23 | $ 3.18
Property, Plant and Equipment – Net | $ 5,004.0 |  |  |  | $ 5,087.5 |  |  |  |  |  |  |  |  | $ 5,004.0 | $ 5,087.5 |
Assets | 6,845.6 |  |  |  | 6,422.3 |  |  |  |  |  |  |  |  | 6,845.6 | 6,422.3 |
Deferred Income Taxes | 158.1 |  |  |  | 181.8 |  |  |  |  |  |  |  |  | 158.1 | 181.8 |
Liabilities | 3,497.3 |  |  |  | 3,484.8 |  |  |  |  |  |  |  |  | 3,497.3 | 3,484.8 |
Retained Earnings | 934.8 |  |  |  | 891.4 |  |  |  |  |  |  |  |  | 934.8 | 891.4 |
Members' Equity | $ 3,348.3 |  |  |  | 2,937.5 |  |  |  | $ 2,791.4 |  |  |  |  | $ 3,348.3 | 2,937.5 | $ 2,791.4
Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on Impairment of Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0
Income Tax Benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (39.5)
Net Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 174.2
Comprehensive Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 166.7
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.35
Property, Plant and Equipment – Net |  |  |  |  | 5,100.2 |  |  |  |  |  |  |  |  |  | 5,100.2 |
Assets |  |  |  |  | 6,435.0 |  |  |  |  |  |  |  |  |  | 6,435.0 |
Deferred Income Taxes |  |  |  |  | 185.7 |  |  |  |  |  |  |  |  |  | 185.7 |
Liabilities |  |  |  |  | 3,488.7 |  |  |  |  |  |  |  |  |  | 3,488.7 |
Retained Earnings |  |  |  |  | 900.2 |  |  |  |  |  |  |  |  |  | 900.2 |
Members' Equity |  |  |  |  | 2,946.3 |  |  |  |  |  |  |  |  |  | 2,946.3 |
Revision of Prior Period - Adjusted Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on Impairment of Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.7
Income Tax Benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (43.4)
Net Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 165.4
Comprehensive Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 157.9
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.18
Property, Plant and Equipment – Net |  |  |  |  | 5,087.5 |  |  |  |  |  |  |  |  |  | 5,087.5 |
Assets |  |  |  |  | 6,422.3 |  |  |  |  |  |  |  |  |  | 6,422.3 |
Deferred Income Taxes |  |  |  |  | 181.8 |  |  |  |  |  |  |  |  |  | 181.8 |
Liabilities |  |  |  |  | 3,484.8 |  |  |  |  |  |  |  |  |  | 3,484.8 |
Retained Earnings |  |  |  |  | 891.4 |  |  |  |  |  |  |  |  |  | 891.4 |
Members' Equity |  |  |  |  | 2,937.5 |  |  |  |  |  |  |  |  |  | 2,937.5 |
Revision of Prior Period, Error Correction, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on Impairment of Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.7
Income Tax Benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3.9)
Net Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8.8)
Comprehensive Income Attributable to ALLETE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (8.8)
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.17)
Property, Plant and Equipment – Net |  |  |  |  | (12.7) |  |  |  |  |  |  |  |  |  | (12.7) |
Assets |  |  |  |  | (12.7) |  |  |  |  |  |  |  |  |  | (12.7) |
Deferred Income Taxes |  |  |  |  | (3.9) |  |  |  |  |  |  |  |  |  | (3.9) |
Liabilities |  |  |  |  | (3.9) |  |  |  |  |  |  |  |  |  | (3.9) |
Retained Earnings |  |  |  |  | (8.8) |  |  |  |  |  |  |  |  |  | (8.8) |
Members' Equity |  |  |  |  | $ (8.8) |  |  |  |  |  |  |  |  |  | $ (8.8) |
[1] | See Immaterial Revision to Prior Period in Note 1. Operations and Significant Accounting Policies.

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