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Consolidated Statement of Equity - USD ($) $ in Millions | Total | Common Stock [Member] | Accumulated Other Comprehensive Loss [Member] | Retained Earnings [Member] | Non-controlling Interest [Member]
--- | --- | --- | --- | --- | ---
Balance, Beginning Balance at Dec. 31, 2019 |  | $ 1,436.7 | $ (23.6) | $ 818.8 | $ 103.7
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 5.0 |  |  |
Unrealized Loss on Debt Securities | $ (0.4) |  | (0.4) |  |
Defined Benefit Pension and Other Postretirement Plans | 0.2 |  | 0.2 |  |
Net Income Attributable ALLETE | 66.3 |  |  | 66.3 |
Common Stock Dividends | 31.9 |  |  | (31.9) |
Proceeds from Non-controlling Interests | 0.0 |  |  |  | 0.0
Net Loss Attributable to Non-Controlling Interest | (1.8) |  |  |  | (1.8)
Distributions to Non-controlling Interest |  |  |  |  | 0.0
Balance, End of Period at Mar. 31, 2020 | $ 2,373.0 | 1,441.7 | (23.8) | 853.2 | 101.9
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Dividends Per Share of Common Stock | $ 0.6175 |  |  |  |
Balance, Beginning Balance at Dec. 31, 2020 | $ 2,800.2 | 1,460.9 | (31.1) | 864.8 | 505.6
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 6.7 |  |  |
Unrealized Loss on Debt Securities | 0.0 |  | 0.0 |  |
Defined Benefit Pension and Other Postretirement Plans | 0.4 |  | 0.4 |  |
Net Income Attributable ALLETE | 51.8 |  |  | 51.8 |
Common Stock Dividends | 32.8 |  |  | (32.8) |
Proceeds from Non-controlling Interests | 28.9 |  |  |  | 28.9
Net Loss Attributable to Non-Controlling Interest | (8.4) |  |  |  | (8.4)
Distributions to Non-controlling Interest |  |  |  |  | (0.4)
Balance, End of Period at Mar. 31, 2021 | $ 2,846.4 | $ 1,467.6 | $ (30.7) | $ 883.8 | $ 525.7
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Dividends Per Share of Common Stock | $ 0.63 |  |  |  |

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