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SEGMENT AND RELATED INFORMATION: - Geographical (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of revenue by geographical location
Net sales	$ 1,854.7	$ 1,859.5	$ 1,818.0	$ 1,753.4	$ 1,694.7	$ 1,723.7	$ 1,837.2	$ 1,841.1	$ 7,285.6	$ 7,096.7	$ 6,654.5
Mexico
Schedule of revenue by geographical location
Net sales									1,531.9	1,649.3	1,523.9
United States
Schedule of revenue by geographical location
Net sales									1,195.6	1,258.6	1,190.3
Peru
Schedule of revenue by geographical location
Net sales									340.0	390.4	374.2
Brazil
Schedule of revenue by geographical location
Net sales									211.7	271.9	240.1
Chile
Schedule of revenue by geographical location
Net sales									191.3	136.3	103.4
Other American countries
Schedule of revenue by geographical location
Net sales									43.1	65.8	91.5
Switzerland
Schedule of revenue by geographical location
Net sales									1,173.4	653.4	602.3
Italy
Schedule of revenue by geographical location
Net sales									297.0	347.3	332.4
Spain
Schedule of revenue by geographical location
Net sales									186.1	169.4	142.8
Other European Countries
Schedule of revenue by geographical location
Net sales									374.6	379.6	337.2
Singapore
Schedule of revenue by geographical location
Net sales									966.9	1,069.2	1,051.3
Japan
Schedule of revenue by geographical location
Net sales									500.8	483.4	479.6
Other Asian countries
Schedule of revenue by geographical location
Net sales									273.2	222.1	185.5
Corporate, other and eliminations
Schedule of revenue by geographical location
Net sales									(83.2)	(79.3)	(71.8)
Corporate, other and eliminations | Mexico
Schedule of revenue by geographical location
Net sales									(83.2)	(79.3)	(71.8)
Mexican Open-pit
Schedule of revenue by geographical location
Net sales									3,963.9	4,075.9	3,972.7
Mexican Open-pit | Mexico
Schedule of revenue by geographical location
Net sales									1,262.2	1,343.0	1,240.0
Mexican Open-pit | United States
Schedule of revenue by geographical location
Net sales									1,054.9	1,008.0	1,001.2
Mexican Open-pit | Peru
Schedule of revenue by geographical location
Net sales									1.6
Mexican Open-pit | Chile
Schedule of revenue by geographical location
Net sales									1.2
Mexican Open-pit | Other American countries
Schedule of revenue by geographical location
Net sales									37.6	60.6	68.1
Mexican Open-pit | Switzerland
Schedule of revenue by geographical location
Net sales									780.9	453.3	473.1
Mexican Open-pit | Italy
Schedule of revenue by geographical location
Net sales									45.1	20.6	27.7
Mexican Open-pit | Spain
Schedule of revenue by geographical location
Net sales									186.1	169.4	142.8
Mexican Open-pit | Other European Countries
Schedule of revenue by geographical location
Net sales									92.8	234.8	230.3
Mexican Open-pit | Singapore
Schedule of revenue by geographical location
Net sales									345.4	528.8	547.9
Mexican Open-pit | Japan
Schedule of revenue by geographical location
Net sales									59.9	71.8	93.0
Mexican Open-pit | Other Asian countries
Schedule of revenue by geographical location
Net sales									96.2	185.6	148.6
Mexican IMMSA Unit
Schedule of revenue by geographical location
Net sales									464.8	527.9	509.5
Mexican IMMSA Unit | Mexico
Schedule of revenue by geographical location
Net sales									352.9	385.6	349.1
Mexican IMMSA Unit | United States
Schedule of revenue by geographical location
Net sales									6.2	6.6	41.7
Mexican IMMSA Unit | Peru
Schedule of revenue by geographical location
Net sales											0.8
Mexican IMMSA Unit | Brazil
Schedule of revenue by geographical location
Net sales									17.3	43.8	48.7
Mexican IMMSA Unit | Other American countries
Schedule of revenue by geographical location
Net sales									2.2	3.8	4.1
Mexican IMMSA Unit | Switzerland
Schedule of revenue by geographical location
Net sales									36.7	43.4	14.3
Mexican IMMSA Unit | Italy
Schedule of revenue by geographical location
Net sales									13.3	21.7	18.6
Mexican IMMSA Unit | Other European Countries
Schedule of revenue by geographical location
Net sales									24.9	19.9	30.3
Mexican IMMSA Unit | Singapore
Schedule of revenue by geographical location
Net sales									10.4	2.2	1.4
Mexican IMMSA Unit | Other Asian countries
Schedule of revenue by geographical location
Net sales									0.9	0.9	0.5
Peruvian Operations
Schedule of revenue by geographical location
Net sales									2,940.1	2,572.2	2,244.1
Peruvian Operations | Mexico
Schedule of revenue by geographical location
Net sales											6.6
Peruvian Operations | United States
Schedule of revenue by geographical location
Net sales									134.5	244.0	147.4
Peruvian Operations | Peru
Schedule of revenue by geographical location
Net sales									338.4	390.4	373.4
Peruvian Operations | Brazil
Schedule of revenue by geographical location
Net sales									194.4	228.1	191.4
Peruvian Operations | Chile
Schedule of revenue by geographical location
Net sales									190.1	136.3	103.4
Peruvian Operations | Other American countries
Schedule of revenue by geographical location
Net sales									3.3	1.4	19.3
Peruvian Operations | Switzerland
Schedule of revenue by geographical location
Net sales									355.8	156.7	114.9
Peruvian Operations | Italy
Schedule of revenue by geographical location
Net sales									238.6	305.0	286.1
Peruvian Operations | Other European Countries
Schedule of revenue by geographical location
Net sales									256.9	124.9	76.6
Peruvian Operations | Singapore
Schedule of revenue by geographical location
Net sales									611.1	538.2	502.0
Peruvian Operations | Japan
Schedule of revenue by geographical location
Net sales									440.9	411.6	386.6
Peruvian Operations | Other Asian countries
Schedule of revenue by geographical location
Net sales									$ 176.1	$ 35.6	$ 36.4

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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