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 (Grupo Mexico) common shares	TREASURY STOCK:	RETAINED EARNINGS:	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS):	STOCKHOLDERS' EQUITY	NON-CONTROLLING INTEREST	Total
Balance at beginning of period at Dec. 31, 2018		$ 3,393.7	$ (2,768.3)	$ (251.3)		$ 6,186.9	$ (2.4)	$ 6,567.4	$ 45.4	$ 6,612.8
Increase (Decrease) in Stockholders' Equity
Net earnings						1,180.2			4.7	1,180.2
Dividends/distributions declared and paid						(927.7)			(1.1)
SCC shareholder derivative lawsuit - received from AMC						36.5				(36.5)
SCC shareholder derivative lawsuit - dividend paid						(36.5)				36.5
Used for corporate purposes			0.4
Other activity, including dividend, interest and foreign currency transaction effect				(20.7)
Other activity of the period		21.9				(0.2)
Balance at end of period at Sep. 30, 2019	$ 8.8	3,415.6	(2,767.9)	(272.0)	$ (3,039.9)	6,439.2		6,821.3	49.0	6,870.3
Balance at beginning of period at Jun. 30, 2019		3,407.6	(2,767.9)	(264.5)		6,358.7	(2.4)	6,740.3	48.3	6,788.6
Increase (Decrease) in Stockholders' Equity
Net earnings						389.6			1.7	389.6
Dividends/distributions declared and paid						(309.2)			(1.0)
Other activity, including dividend, interest and foreign currency transaction effect				(7.5)
Other activity of the period		8.0				0.1
Balance at end of period at Sep. 30, 2019	8.8	3,415.6	(2,767.9)	(272.0)	(3,039.9)	6,439.2		6,821.3	49.0	6,870.3
Balance at beginning of period at Dec. 31, 2019		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/distributions declared and paid						(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 period at Sep. 30, 2020	8.8	3,425.7	(2,767.5)	(280.5)	(3,048.0)	6,642.8		7,019.2	50.0	7,069.2
Balance at beginning of period at Jun. 30, 2020		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/distributions declared and paid						(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 period at Sep. 30, 2020	$ 8.8	$ 3,425.7	$ (2,767.5)	$ (280.5)	$ (3,048.0)	$ 6,642.8		$ 7,019.2	$ 50.0	$ 7,069.2