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Consolidated Statement of Equity - USD ($) $ in Millions | Total | Common Stock | Accumulated Other Comprehensive Loss | Retained Earnings | Non-Controlling Interest in Subsidiaries
--- | --- | --- | --- | --- | ---
Balance, Beginning of Period at Dec. 31, 2021 |  | $ 1,536.7 | $ (23.8) | $ 891.4 | $ 533.2
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 244.8 |  |  |
Unrealized Gain (Loss) on Debt Securities | $ (0.4) |  | (0.4) |  |
Defined Benefit Pension and Other Postretirement Plans | (0.2) |  | (0.2) |  |
Net Income Attributable to ALLETE | 189.3 |  |  | 189.3 |
Common Stock Dividends |  |  |  | (145.9) |
Proceeds from Non-Controlling Interest in Subsidiaries – Net of Issuance Costs |  |  |  |  | 182.9
Net Loss Attributable to Non-Controlling Interest | 58.0 |  |  |  | (58.0)
Distributions to Non-Controlling Interest |  |  |  |  | (1.7)
Balance, End of Period at Dec. 31, 2022 | 3,348.3 | 1,781.5 | (24.4) | 934.8 | 656.4
Balance, Beginning of Period at Dec. 31, 2021 | 0.0 |  |  |  |
Redeemable Non-Controlling Interest |  |  |  |  |
Proceeds from Non-Controlling Interest in Subsidiaries | 0.0 |  |  |  |
Net Loss Attributable to Non-Controlling Interest | 0.0 |  |  |  |
Distributions to Non-Controlling Interest | 0.0 |  |  |  |
Total Redeemable Non-Controlling Interest at Dec. 31, 2022 | $ 0.0 |  |  |  |
Redeemable Non-Controlling Interest |  |  |  |  |
Dividends Per Share of Common Stock (in usd per share) | $ 2.60 |  |  |  |
Common Stock Issued |  | 22.2 |  |  |
Unrealized Gain (Loss) on Debt Securities | $ 0.3 |  | 0.3 |  |
Defined Benefit Pension and Other Postretirement Plans | 3.6 |  | 3.6 |  |
Net Income Attributable to ALLETE | 247.1 |  |  | 247.1 |
Common Stock Dividends |  |  |  | (155.5) |
Proceeds from Non-Controlling Interest in Subsidiaries – Net of Issuance Costs |  |  |  |  | 9.9
Net Loss Attributable to Non-Controlling Interest | 68.2 |  |  |  | (60.8)
Distributions to Non-Controlling Interest |  |  |  |  | (8.5)
Balance, End of Period at Dec. 31, 2023 | 3,406.6 | 1,803.7 | (20.5) | 1,026.4 | 597.0
Redeemable Non-Controlling Interest |  |  |  |  |
Proceeds from Non-Controlling Interest in Subsidiaries | 7.9 |  |  |  |
Net Loss Attributable to Non-Controlling Interest | (7.4) |  |  |  |
Distributions to Non-Controlling Interest | 0.0 |  |  |  |
Total Redeemable Non-Controlling Interest at Dec. 31, 2023 | $ 0.5 |  |  |  |
Redeemable Non-Controlling Interest |  |  |  |  |
Dividends Per Share of Common Stock (in usd per share) | $ 2.71 |  |  |  |
Common Stock Issued |  | 19.5 |  |  |
Unrealized Gain (Loss) on Debt Securities | $ 0.1 |  | 0.1 |  |
Defined Benefit Pension and Other Postretirement Plans | 2.3 |  | 2.3 |  |
Net Income Attributable to ALLETE | 179.3 |  |  | 179.3 |
Common Stock Dividends |  |  |  | (162.8) |
Proceeds from Non-Controlling Interest in Subsidiaries – Net of Issuance Costs |  |  |  |  | 1.3
Net Loss Attributable to Non-Controlling Interest | 57.6 |  |  |  | (55.0)
Distributions to Non-Controlling Interest |  |  |  |  | (1.2)
Balance, End of Period at Dec. 31, 2024 | 3,390.1 | $ 1,823.2 | $ (18.1) | $ 1,042.9 | $ 542.1
Redeemable Non-Controlling Interest |  |  |  |  |
Proceeds from Non-Controlling Interest in Subsidiaries | 2.8 |  |  |  |
Net Loss Attributable to Non-Controlling Interest | (2.6) |  |  |  |
Distributions to Non-Controlling Interest | (0.3) |  |  |  |
Total Redeemable Non-Controlling Interest at Dec. 31, 2024 | $ 0.4 |  |  |  |
Redeemable Non-Controlling Interest |  |  |  |  |
Dividends Per Share of Common Stock (in usd per share) | $ 2.82 |  |  |  |

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