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SEGMENT AND RELATED INFORMATION: - Sales (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
SALES VALUE PER SEGMENT:
Net sales outside of segments	$ 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
Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									4,220.8	3,994.1	4,518.1
Molybdenum
SALES VALUE PER SEGMENT:
Net sales outside of segments									268.0	239.0	506.9
Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									294.3	226.7	273.2
Zinc
SALES VALUE PER SEGMENT:
Net sales outside of segments									234.4	210.7	209.8
Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									362.3	375.4	279.7
Corporate, other and eliminations
SALES VALUE PER SEGMENT:
Net sales outside of segments									(72.0)	(67.6)	(90.4)
Corporate, other and eliminations | Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									(32.0)	(30.6)	(46.4)
Corporate, other and eliminations | Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									(31.6)	(26.5)	(33.0)
Corporate, other and eliminations | Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									(8.4)	(10.5)	(11.0)
Mexican Open-pit | Operating segment
SALES VALUE PER SEGMENT:
Net sales outside of segments									3,234.3	2,703.9	2,954.6
Mexican Open-pit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									2,663.1	2,237.2	2,380.2
Mexican Open-pit | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales outside of segments									144.0	109.0	299.8
Mexican Open-pit | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									182.3	129.5	146.6
Mexican Open-pit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									244.9	228.2	128.0
Mexican IMMSA Unit | Operating segment
SALES VALUE PER SEGMENT:
Net sales outside of segments									423.1	388.3	441.7
Mexican IMMSA Unit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									32.0	30.6	46.4
Mexican IMMSA Unit | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									82.1	66.5	88.0
Mexican IMMSA Unit | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales outside of segments									234.4	210.7	209.8
Mexican IMMSA Unit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									74.6	80.5	97.5
Peruvian Operations | Operating segment
SALES VALUE PER SEGMENT:
Net sales outside of segments									1,794.4	2,021.3	2,481.8
Peruvian Operations | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									1,557.7	1,756.9	2,137.9
Peruvian Operations | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales outside of segments									124.0	130.0	207.1
Peruvian Operations | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									61.5	57.2	71.6
Peruvian Operations | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									$ 51.2	$ 77.2	$ 65.2

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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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