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Consolidated Statement of Shareholders' Equity - USD ($) | Total | Common Stock [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | ---
Balance, Beginning Balance at Dec. 31, 2018 |  | $ 1,428,500,000 | $ (27,300,000) | $ 754,600,000 | $ 0
Consolidated Statement of Shareholders' Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 4,800,000 |  |  |
Unrealized Gain (Loss) on Debt Securities | $ 200,000 |  | 200,000 |  |
Defined Benefit Pension and Other Postretirement Plans | 200,000 |  | 200,000 |  |
Net Income (Loss) Attributable to ALLETE | 104,700,000 |  |  | 104,700,000 |
Common Stock Dividends | 60,700,000 |  |  | (60,700,000) |
Proceeds from Noncontrolling Interests | 0 |  |  |  | 0
Net Loss Attributable to Non-Controlling Interest | 0 |  |  |  | 0
Balance, End of Period at Jun. 30, 2019 | $ 2,205,000,000.0 | 1,433,300,000 | (26,900,000) | 798,600,000 | 0
Consolidated Statement of Shareholders' Equity [Roll Forward] |  |  |  |  |
Dividends Per Share of Common Stock | $ 1.175 |  |  |  |
Balance, Beginning Balance at Mar. 31, 2019 |  | 1,431,100,000 | (27,200,000) | 794,800,000 | 0
Consolidated Statement of Shareholders' Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 2,200,000 |  |  |
Unrealized Gain (Loss) on Debt Securities | $ 100,000 |  | 100,000 |  |
Defined Benefit Pension and Other Postretirement Plans | 200,000 |  | 200,000 |  |
Net Income (Loss) Attributable to ALLETE | 34,200,000 |  |  | 34,200,000 |
Common Stock Dividends |  |  |  | (30,400,000) |
Proceeds from Noncontrolling Interests |  |  |  |  | 0
Net Loss Attributable to Non-Controlling Interest | 0 |  |  |  | 0
Balance, End of Period at Jun. 30, 2019 | $ 2,205,000,000.0 | 1,433,300,000 | (26,900,000) | 798,600,000 | 0
Consolidated Statement of Shareholders' Equity [Roll Forward] |  |  |  |  |
Dividends Per Share of Common Stock | $ 0.5875 |  |  |  |
Balance, Beginning Balance at Dec. 31, 2019 | $ 2,335,600,000 | 1,436,700,000 | (23,600,000) | 818,800,000 | 103,700,000
Consolidated Statement of Shareholders' Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 11,000,000.0 |  |  |
Unrealized Gain (Loss) on Debt Securities | 0 |  | 0 |  |
Defined Benefit Pension and Other Postretirement Plans | 300,000 |  | 300,000 |  |
Net Income (Loss) Attributable to ALLETE | 86,400,000 |  |  | 86,400,000 |
Common Stock Dividends | 63,900,000 |  |  | (63,900,000) |
Proceeds from Noncontrolling Interests | 67,800,000 |  |  |  | 67,800,000
Net Loss Attributable to Non-Controlling Interest | (5,000,000.0) |  |  |  | (5,000,000.0)
Balance, End of Period at Jun. 30, 2020 | $ 2,432,200,000 | 1,447,700,000 | (23,300,000) | 841,300,000 | 166,500,000
Consolidated Statement of Shareholders' Equity [Roll Forward] |  |  |  |  |
Dividends Per Share of Common Stock | $ 1.235 |  |  |  |
Balance, Beginning Balance at Mar. 31, 2020 |  | 1,441,700,000 | (23,800,000) | 853,200,000 | 101,900,000
Consolidated Statement of Shareholders' Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 6,000,000.0 |  |  |
Unrealized Gain (Loss) on Debt Securities | $ 400,000 |  | 400,000 |  |
Defined Benefit Pension and Other Postretirement Plans | 100,000 |  | 100,000 |  |
Net Income (Loss) Attributable to ALLETE | 20,100,000 |  |  | 20,100,000 |
Common Stock Dividends |  |  |  | (32,000,000.0) |
Proceeds from Noncontrolling Interests |  |  |  |  | 67,800,000
Net Loss Attributable to Non-Controlling Interest | (3,200,000) |  |  |  | (3,200,000)
Balance, End of Period at Jun. 30, 2020 | $ 2,432,200,000 | $ 1,447,700,000 | $ (23,300,000) | $ 841,300,000 | $ 166,500,000
Consolidated Statement of Shareholders' Equity [Roll Forward] |  |  |  |  |
Dividends Per Share of Common Stock | $ 0.6175 |  |  |  |

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