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SEGMENT AND RELATED INFORMATION: - Geographical (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of revenue by geographical location
Net sales	$ 10,047.9	$ 10,934.1	$ 7,984.9
Mexico
Schedule of revenue by geographical location
Net sales	2,288.7	2,140.0	1,526.7
United States
Schedule of revenue by geographical location
Net sales	1,910.4	1,933.5	1,363.4
Peru
Schedule of revenue by geographical location
Net sales	615.0	586.3	335.0
Brazil
Schedule of revenue by geographical location
Net sales	452.0	437.1	233.0
Chile
Schedule of revenue by geographical location
Net sales	444.5	384.5	221.1
Latin America, other
Schedule of revenue by geographical location
Net sales	65.7	42.7	42.4
Switzerland
Schedule of revenue by geographical location
Net sales	1,477.8	1,697.0	1,443.3
Italy
Schedule of revenue by geographical location
Net sales	261.4	307.8	271.6
Spain
Schedule of revenue by geographical location
Net sales	458.2	502.0	199.4
Other European Countries
Schedule of revenue by geographical location
Net sales	362.8	732.2	521.7
Singapore
Schedule of revenue by geographical location
Net sales	288.4	957.8	863.7
China
Schedule of revenue by geographical location
Net sales	572.5	214.7	145.5
Japan
Schedule of revenue by geographical location
Net sales	616.2	629.1	579.5
Other Asian countries
Schedule of revenue by geographical location
Net sales	234.3	369.4	238.6
Corporate, other and eliminations
Schedule of revenue by geographical location
Net sales	(299.7)	(145.9)	(111.0)
Corporate, other and eliminations | Mexico
Schedule of revenue by geographical location
Net sales	(138.0)	(145.9)	(111.0)
Corporate, other and eliminations | Peru
Schedule of revenue by geographical location
Net sales	(161.7)
Mexican Open-Pit
Schedule of revenue by geographical location
Net sales	5,772.6	6,109.0	4,412.4
Mexican Open-Pit | Mexico
Schedule of revenue by geographical location
Net sales	1,962.0	1,893.3	1,296.6
Mexican Open-Pit | United States
Schedule of revenue by geographical location
Net sales	1,486.2	1,648.1	1,182.8
Mexican Open-Pit | Peru
Schedule of revenue by geographical location
Net sales	162.2
Mexican Open-Pit | Chile
Schedule of revenue by geographical location
Net sales	19.9	3.3	18.8
Mexican Open-Pit | Latin America, other
Schedule of revenue by geographical location
Net sales	35.4	31.3	36.8
Mexican Open-Pit | Switzerland
Schedule of revenue by geographical location
Net sales	693.7	1,097.2	898.2
Mexican Open-Pit | Italy
Schedule of revenue by geographical location
Net sales	2.1	0.7	0.1
Mexican Open-Pit | Spain
Schedule of revenue by geographical location
Net sales	420.7	410.2	199.4
Mexican Open-Pit | Other European Countries
Schedule of revenue by geographical location
Net sales	124.3	275.8	199.9
Mexican Open-Pit | Singapore
Schedule of revenue by geographical location
Net sales	103.9	441.9	319.9
Mexican Open-Pit | China
Schedule of revenue by geographical location
Net sales	517.6	189.7	132.6
Mexican Open-Pit | Japan
Schedule of revenue by geographical location
Net sales	88.0	23.6	46.9
Mexican Open-Pit | Other Asian countries
Schedule of revenue by geographical location
Net sales	156.6	93.9	80.4
Mexican IMMSA Unit
Schedule of revenue by geographical location
Net sales	666.5	600.2	529.9
Mexican IMMSA Unit | Mexico
Schedule of revenue by geographical location
Net sales	464.7	387.6	341.1
Mexican IMMSA Unit | United States
Schedule of revenue by geographical location
Net sales	54.0	52.3	27.2
Mexican IMMSA Unit | Peru
Schedule of revenue by geographical location
Net sales		(0.3)	13.0
Mexican IMMSA Unit | Brazil
Schedule of revenue by geographical location
Net sales	41.3	30.7	18.7
Mexican IMMSA Unit | Latin America, other
Schedule of revenue by geographical location
Net sales	2.6	0.7	2.9
Mexican IMMSA Unit | Switzerland
Schedule of revenue by geographical location
Net sales	44.6	55.1	69.9
Mexican IMMSA Unit | Italy
Schedule of revenue by geographical location
Net sales	19.3	8.8	9.5
Mexican IMMSA Unit | Other European Countries
Schedule of revenue by geographical location
Net sales	31.1	45.5	40.2
Mexican IMMSA Unit | Singapore
Schedule of revenue by geographical location
Net sales	8.4	19.4	6.9
Mexican IMMSA Unit | Other Asian countries
Schedule of revenue by geographical location
Net sales	0.5	0.4	0.5
Peruvian Operations
Schedule of revenue by geographical location
Net sales	3,908.5	4,370.8	3,153.6
Peruvian Operations | Mexico
Schedule of revenue by geographical location
Net sales		5.0
Peruvian Operations | United States
Schedule of revenue by geographical location
Net sales	370.2	233.1	153.4
Peruvian Operations | Peru
Schedule of revenue by geographical location
Net sales	614.5	586.6	322.0
Peruvian Operations | Brazil
Schedule of revenue by geographical location
Net sales	410.7	406.4	214.3
Peruvian Operations | Chile
Schedule of revenue by geographical location
Net sales	424.6	381.2	202.3
Peruvian Operations | Latin America, other
Schedule of revenue by geographical location
Net sales	27.7	10.7	2.7
Peruvian Operations | Switzerland
Schedule of revenue by geographical location
Net sales	739.5	544.7	475.2
Peruvian Operations | Italy
Schedule of revenue by geographical location
Net sales	240.0	298.3	262.0
Peruvian Operations | Spain
Schedule of revenue by geographical location
Net sales	37.5	91.8
Peruvian Operations | Other European Countries
Schedule of revenue by geographical location
Net sales	207.4	410.9	281.6
Peruvian Operations | Singapore
Schedule of revenue by geographical location
Net sales	176.1	496.5	536.9
Peruvian Operations | China
Schedule of revenue by geographical location
Net sales	54.9	25.0	12.9
Peruvian Operations | Japan
Schedule of revenue by geographical location
Net sales	528.2	605.5	532.6
Peruvian Operations | Other Asian countries
Schedule of revenue by geographical location
Net sales	$ 77.2	$ 275.1	$ 157.7

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