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SEGMENT AND RELATED INFORMATION: - Geographical (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of revenue by geographical location
Net sales	$ 1,864.3	$ 1,676.5	$ 1,529.8	$ 1,583.9	$ 1,398.9	$ 1,400.7	$ 1,335.1	$ 1,245.1	$ 6,654.5	$ 5,379.8	$ 5,045.9
Mexico
Schedule of revenue by geographical location
Net sales									1,551.5	1,409.7	1,641.0
United States
Schedule of revenue by geographical location
Net sales									1,162.5	1,050.0	864.0
Peru
Schedule of revenue by geographical location
Net sales									374.3	294.4	324.3
Brazil
Schedule of revenue by geographical location
Net sales									240.1	196.0	276.4
Chile
Schedule of revenue by geographical location
Net sales									103.4	92.4	102.0
Other American countries
Schedule of revenue by geographical location
Net sales									91.5	74.3	89.2
Switzerland
Schedule of revenue by geographical location
Net sales									602.4	398.1	294.9
Italy
Schedule of revenue by geographical location
Net sales									332.4	343.8	324.1
Other European Countries
Schedule of revenue by geographical location
Net sales									480.0	273.1	125.4
Singapore
Schedule of revenue by geographical location
Net sales									1,051.3	652.7	312.8
Japan
Schedule of revenue by geographical location
Net sales									479.5	409.8	335.0
Other Asian countries
Schedule of revenue by geographical location
Net sales									$ 185.6	$ 185.5	$ 356.8

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- Definition

Aggregate revenue from the sale of minerals and related products, and from rendering services such as exploration, development, mining, processing and providing mining support activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a),(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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