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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) | $ 900.2 | $ 533.2
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 240.5 |  |  |
Unrealized Gain (Loss) on Debt Securities | $ (0.4) |  | (0.4) |  |
Defined Benefit Pension and Other Postretirement Plans | 0.4 |  | 0.4 |  |
Net Income Attributable to ALLETE | 137.6 |  |  | 137.6 |
Common Stock Dividends |  |  |  | (108.6) |
Proceeds from Non-Controlling Interest in Subsidiaries – Net |  |  |  |  | 182.9
Net Loss Attributable to Non-Controlling Interest | 43.5 |  |  |  | (43.5)
Distributions to Non-Controlling Interest |  |  |  |  | (1.3)
Balance, End of Period at Sep. 30, 2022 | $ 3,353.9 | 1,777.2 | (23.8) | 929.2 | 671.3
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Dividends Per Share of Common Stock (in usd per share | $ 1.95 |  |  |  |
Balance, Beginning of Period at Dec. 31, 2021 |  | 1,536.7 | (23.8) | 900.2 | 533.2
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 Jun. 30, 2022 |  | 1,771.7 | (23.9) | 932.6 | 678.5
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 5.5 |  |  |
Unrealized Gain (Loss) on Debt Securities | 0.0 |  |  |  |
Defined Benefit Pension and Other Postretirement Plans | 0.1 |  | 0.1 |  |
Net Income Attributable to ALLETE | 33.7 |  |  | 33.7 |
Common Stock Dividends |  |  |  | (37.1) |
Net Loss Attributable to Non-Controlling Interest | 6.9 |  |  |  | (6.9)
Distributions to Non-Controlling Interest |  |  |  |  | (0.3)
Balance, End of Period at Sep. 30, 2022 | $ 3,353.9 | 1,777.2 | (23.8) | 929.2 | 671.3
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Dividends Per Share of Common Stock (in usd per share | $ 0.65 |  |  |  |
Balance, Beginning of Period at Dec. 31, 2022 | $ 3,348.3 | 1,781.5 | (24.4) | 934.8 | 656.4
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 15.7 |  |  |
Unrealized Gain (Loss) on Debt Securities | 0.1 |  | 0.1 |  |
Defined Benefit Pension and Other Postretirement Plans | (0.2) |  | (0.2) |  |
Net Income Attributable to ALLETE | 195.6 |  |  | 195.6 |
Common Stock Dividends |  |  |  | (116.5) |
Proceeds from Non-Controlling Interest in Subsidiaries – Net |  |  |  |  | 9.9
Net Loss Attributable to Non-Controlling Interest | 47.7 |  |  |  | (47.7)
Distributions to Non-Controlling Interest |  |  |  |  | (8.5)
Balance, End of Period at Sep. 30, 2023 | $ 3,396.7 | 1,797.2 | (24.5) | 1,013.9 | 610.1
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Dividends Per Share of Common Stock (in usd per share | $ 2.0325 |  |  |  |
Balance, Beginning of Period at Jun. 30, 2023 |  | 1,791.6 | (24.4) | 966.9 | 634.4
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 5.6 |  |  |
Unrealized Gain (Loss) on Debt Securities | $ 0.0 |  |  |  |
Defined Benefit Pension and Other Postretirement Plans | (0.1) |  | (0.1) |  |
Net Income Attributable to ALLETE | 85.9 |  |  | 85.9 |
Common Stock Dividends |  |  |  | (38.9) |
Net Loss Attributable to Non-Controlling Interest | 16.3 |  |  |  | (16.3)
Distributions to Non-Controlling Interest |  |  |  |  | (8.0)
Balance, End of Period at Sep. 30, 2023 | $ 3,396.7 | $ 1,797.2 | $ (24.5) | $ 1,013.9 | $ 610.1
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Dividends Per Share of Common Stock (in usd per share | $ 0.6775 |  |  |  |

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