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SEGMENT AND RELATED INFORMATION: (Details 2) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SALES VALUE PER SEGMENT:
Net sales outside of segments	$ 1,254.6	$ 1,133.6	$ 1,382.9	$ 1,274.8	$ 1,471.3	$ 1,474.6	$ 1,487.4	$ 1,354.4	$ 5,045.9	$ 5,787.7	$ 5,952.9
Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									3,994.1	4,518.1	4,654.8
Molybdenum
SALES VALUE PER SEGMENT:
Net sales outside of segments									239.0	506.9	389.2
Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									226.7	273.2	393.7
Zinc
SALES VALUE PER SEGMENT:
Net sales outside of segments									210.7	209.8	200.9
Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									375.4	279.7	314.3
Corporate, other and eliminations
SALES VALUE PER SEGMENT:
Net sales outside of segments									(67.6)	(90.4)	(96.9)
Corporate, other and eliminations | Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									(30.6)	(46.4)	(48.4)
Corporate, other and eliminations | Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									(26.5)	(33.0)	(38.7)
Corporate, other and eliminations | Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									(10.5)	(11.0)	(9.8)
Mexican Open-pit | Operating segment
SALES VALUE PER SEGMENT:
Net sales outside of segments									2,703.9	2,954.6	2,976.0
Mexican Open-pit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									2,237.2	2,380.2	2,365.5
Mexican Open-pit | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales outside of segments									109.0	299.8	241.3
Mexican Open-pit | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									129.5	146.6	242.7
Mexican Open-pit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									228.2	128.0	126.5
Mexican IMMSA Unit | Operating segment
SALES VALUE PER SEGMENT:
Net sales outside of segments									388.3	441.7	459.2
Mexican IMMSA Unit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									30.6	46.4	48.4
Mexican IMMSA Unit | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									66.5	88.0	110.0
Mexican IMMSA Unit | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales outside of segments									210.7	209.8	200.9
Mexican IMMSA Unit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									80.5	97.5	99.9
Peruvian Operations | Operating segment
SALES VALUE PER SEGMENT:
Net sales outside of segments									2,021.3	2,481.8	2,614.6
Peruvian Operations | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									1,756.9	2,137.9	2,289.3
Peruvian Operations | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales outside of segments									130.0	207.1	147.9
Peruvian Operations | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									57.2	71.6	79.7
Peruvian Operations | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									$ 77.2	$ 65.2	$ 97.7

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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=26872669&loc=d3e20235-122688

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