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SEGMENT AND RELATED INFORMATION: - Geographical (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of revenue by geographical location
Net sales	$ 1,398.9	$ 1,400.7	$ 1,335.1	$ 1,245.1	$ 1,254.6	$ 1,133.6	$ 1,382.9	$ 1,274.8	$ 5,379.8	$ 5,045.9	$ 5,787.7
Mexico
Schedule of revenue by geographical location
Net sales									1,409.7	1,641.0	1,708.9
United States
Schedule of revenue by geographical location
Net sales									1,050.0	862.5	1,059.3
Europe
Schedule of revenue by geographical location
Net sales									1,014.9	745.1	937.5
Japan
Schedule of revenue by geographical location
Net sales									409.8	445.9	447.8
Singapore
Schedule of revenue by geographical location
Net sales									652.8	369.8	299.0
Peru
Schedule of revenue by geographical location
Net sales									294.4	324.3	282.2
Other Asian countries
Schedule of revenue by geographical location
Net sales									185.5	189.3	187.1
Brazil
Schedule of revenue by geographical location
Net sales									196.0	276.4	372.4
Chile
Schedule of revenue by geographical location
Net sales									92.4	102.0	401.5
Other American
Schedule of revenue by geographical location
Net sales									$ 74.3	$ 89.6	$ 92.0

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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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