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Equity Investments - Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | 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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Equity Method Investments [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investment Beginning Balance |  |  |  | $ 331.2 |  |  |  | $ 322.7 |  |  |  |  | $ 331.2 | $ 322.7 |
Cash Investments |  |  |  |  |  |  |  |  |  |  |  |  | 5.8 | 8.2 | $ 5.9
Equity in ATC Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 25.0 | 21.7 | 18.7
Equity Investment Ending Balance | $ 340.1 |  |  |  | $ 331.2 |  |  |  | $ 322.7 |  |  |  | 340.1 | 331.2 | 322.7
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current Assets | 435.2 |  |  |  | 468.1 |  |  |  |  |  |  |  | 435.2 | 468.1 |
Total Assets | 6,754.3 |  |  |  | 6,656.4 |  |  |  | 6,845.6 |  |  |  | 6,754.3 | 6,656.4 | 6,845.6
Current Liabilities | 404.2 |  |  |  | 377.6 |  |  |  |  |  |  |  | 404.2 | 377.6 |
Members’ Equity | 3,390.1 |  |  |  | 3,406.6 |  |  |  | 3,348.3 |  |  |  | 3,390.1 | 3,406.6 | 3,348.3
Total Liabilities and Members’ Equity | 6,754.3 |  |  |  | 6,656.4 |  |  |  |  |  |  |  | 6,754.3 | 6,656.4 |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | 364.8 | $ 407.2 | $ 354.5 | 403.3 | 402.7 | $ 378.8 | $ 533.4 | 564.9 | 425.8 | $ 388.3 | $ 373.1 | $ 383.5 | 1,529.8 | 1,879.8 | 1,570.7
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 25.0 | 21.7 | 18.7
ALLETE’s Equity in Net Income |  |  |  |  |  |  |  |  |  |  |  |  | 121.7 | 178.9 | 131.3
Net loss attributable to non-controlling interest |  |  |  |  |  |  |  |  |  |  |  |  | (57.6) | (68.2) | (58.0)
ATC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current Assets | 126.6 |  |  |  | 115.2 |  |  |  |  |  |  |  | 126.6 | 115.2 |
Non-Current Assets | 6,792.6 |  |  |  | 6,337.0 |  |  |  |  |  |  |  | 6,792.6 | 6,337.0 |
Total Assets | 6,919.2 |  |  |  | 6,452.2 |  |  |  |  |  |  |  | 6,919.2 | 6,452.2 |
Current Liabilities | 482.4 |  |  |  | 495.9 |  |  |  |  |  |  |  | 482.4 | 495.9 |
Long-Term Debt | 3,083.4 |  |  |  | 2,736.0 |  |  |  |  |  |  |  | 3,083.4 | 2,736.0 |
Other Non-Current Liabilities | 545.0 |  |  |  | 585.2 |  |  |  |  |  |  |  | 545.0 | 585.2 |
Members’ Equity | 2,808.4 |  |  |  | 2,635.1 |  |  |  |  |  |  |  | 2,808.4 | 2,635.1 |
Total Liabilities and Members’ Equity | 6,919.2 |  |  |  | 6,452.2 |  |  |  |  |  |  |  | 6,919.2 | 6,452.2 |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 911.3 | 818.9 | 751.2
Operating Expense |  |  |  |  |  |  |  |  |  |  |  |  | 442.3 | 407.6 | 381.5
Other Expense |  |  |  |  |  |  |  |  |  |  |  |  | 137.8 | 131.7 | 122.9
ALLETE’s Equity in Net Income |  |  |  |  |  |  |  |  |  |  |  |  | 331.2 | 279.6 | 246.8
Nobles 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to non-controlling interest |  |  |  |  |  |  |  |  |  |  |  |  | 11.7 |  |
ATC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investment Beginning Balance |  |  |  | 179.7 |  |  |  | $ 165.4 |  |  |  |  | 179.7 | 165.4 |
Cash Investments |  |  |  |  |  |  |  |  |  |  |  |  | 5.8 | 8.2 |
Equity in ATC Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 26.5 | 23.1 | 19.3
Distributed ATC Earnings |  |  |  |  |  |  |  |  |  |  |  |  | (18.9) | (18.3) |
Amortization of the Remeasurement of Deferred Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  | 1.3 | 1.3 |
Equity Investment Ending Balance | 194.4 |  |  |  | 179.7 |  |  |  | $ 165.4 |  |  |  | 194.4 | 179.7 | 165.4
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 26.5 | 23.1 | $ 19.3
Nobles 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investment Beginning Balance |  |  |  | $ 151.5 |  |  |  |  |  |  |  |  | 151.5 |  |
Equity in ATC Earnings |  |  |  |  |  |  |  |  |  |  |  |  | (1.5) |  |
Distributed ATC Earnings |  |  |  |  |  |  |  |  |  |  |  |  | (4.3) |  |
Equity Investment Ending Balance | $ 145.7 |  |  |  | $ 151.5 |  |  |  |  |  |  |  | 145.7 | $ 151.5 |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  | $ (1.5) |  |

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