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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions | CAPITAL STOCK: | ADDITIONAL PAID-IN CAPITAL: | TREASURY STOCK: Southern Copper common shares | TREASURY STOCK: Parent Company common shares | TREASURY STOCK: | RETAINED EARNINGS: | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS): | STOCKHOLDERS' EQUITY | NON-CONTROLLING INTEREST | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of year at Dec. 31, 2019 | $ 8.8 | $ 3,424.9 | $ (2,767.9) | $ (281.0) |  | $ 6,435.6 | $ (10.1) | $ 6,810.3 | $ 47.9 | $ 6,858.2
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  | 980.3 |  |  | 4.9 | 980.3
Dividends declared and paid, common stock, per share, 2021- '$2.20, 2020- '$1.00 |  |  |  |  |  | (773.1) |  |  | (2.8) |
Used for corporate purposes |  |  | 0.4 |  |  |  |  |  |  |
Other activity, including dividend, interest and foreign currency transaction effect |  |  |  | 0.5 |  |  |  |  |  |
Other activity of the period |  | 0.8 |  |  |  |  |  |  |  |
Balance at end of year at Sep. 30, 2020 |  | 3,425.7 | (2,767.5) | (280.5) | $ (3,048.0) | 6,642.8 | (10.1) | 7,019.2 | 50.0 | 7,069.2
Balance at beginning of year at Jun. 30, 2020 | 8.8 | 3,418.2 | (2,767.9) | (273.6) |  | 6,446.1 | (10.1) | 6,821.5 | 48.1 | 6,869.6
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  | 506.0 |  |  | 2.1 | 506.0
Dividends declared and paid, common stock, per share, 2021- '$2.20, 2020- '$1.00 |  |  |  |  |  | (309.2) |  |  | (0.2) |
Used for corporate purposes |  |  | 0.4 |  |  |  |  |  |  |
Other activity, including dividend, interest and foreign currency transaction effect |  |  |  | (6.9) |  |  |  |  |  |
Other activity of the period |  | 7.5 |  |  |  | (0.1) |  |  |  |
Balance at end of year at Sep. 30, 2020 |  | 3,425.7 | (2,767.5) | (280.5) | (3,048.0) | 6,642.8 | (10.1) | 7,019.2 | 50.0 | 7,069.2
Balance at beginning of year at Dec. 31, 2020 | 8.8 | 3,441.5 | (2,767.5) | (296.0) |  | 6,846.4 | (8.4) | 7,224.8 | 51.2 | 7,276.0
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  | 2,564.2 |  |  | 10.6 | 2,564.2
Dividends declared and paid, common stock, per share, 2021- '$2.20, 2020- '$1.00 |  |  |  |  |  | (1,700.8) |  |  | (4.4) |
Used for corporate purposes |  |  | 0.1 |  |  |  |  |  |  |
Other activity, including dividend, interest and foreign currency transaction effect |  |  |  | (17.4) |  |  |  |  |  |
Other activity of the period |  | 18.7 |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  | 6.4 |  |  | 6.4
Balance at end of year at Sep. 30, 2021 |  | 3,460.2 | (2,767.4) | (313.4) | (3,080.8) | 7,709.8 | (2.0) | 8,096.0 | 57.4 | 8,153.4
Balance at beginning of year at Jun. 30, 2021 | $ 8.8 | 3,454.9 | (2,767.4) | (308.4) |  | 7,538.0 | (8.4) | 7,917.5 | 55.3 | 7,972.8
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  | 867.6 |  |  | 3.6 | 867.6
Dividends declared and paid, common stock, per share, 2021- '$2.20, 2020- '$1.00 |  |  |  |  |  | (695.8) |  |  | (1.5) |
Other activity, including dividend, interest and foreign currency transaction effect |  |  |  | (5.0) |  |  |  |  |  |
Other activity of the period |  | 5.3 |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  | 6.4 |  |  | 6.4
Balance at end of year at Sep. 30, 2021 |  | $ 3,460.2 | $ (2,767.4) | $ (313.4) | $ (3,080.8) | $ 7,709.8 | $ (2.0) | $ 8,096.0 | $ 57.4 | $ 8,153.4

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