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SEGMENT AND RELATED INFORMATION: - Sales (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
SALES VALUE PER SEGMENT:
Net sales outside of segments	$ 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
Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									5,476.5	4,220.8	3,994.1
Molybdenum
SALES VALUE PER SEGMENT:
Net sales outside of segments									353.4	268.0	239.0
Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									286.3	294.3	226.7
Zinc
SALES VALUE PER SEGMENT:
Net sales outside of segments									326.6	234.4	210.7
Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									211.7	362.3	375.4
Corporate, other and eliminations
SALES VALUE PER SEGMENT:
Net sales outside of segments									(71.8)	(72.0)	(67.6)
Corporate, other and eliminations | Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									(37.3)	(32.0)	(30.6)
Corporate, other and eliminations | Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									(26.9)	(31.6)	(26.5)
Corporate, other and eliminations | Zinc
SALES VALUE PER SEGMENT:
Net sales outside of segments									(0.6)
Corporate, other and eliminations | Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									(7.0)	(8.4)	(10.5)
Mexican Open-pit | Operating segment
SALES VALUE PER SEGMENT:
Net sales outside of segments									3,972.7	3,234.3	2,703.9
Mexican Open-pit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									3,480.2	2,663.1	2,237.2
Mexican Open-pit | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales outside of segments									224.0	144.0	109.0
Mexican Open-pit | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									170.7	182.3	129.5
Mexican Open-pit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									97.8	244.9	228.2
Mexican IMMSA Unit | Operating segment
SALES VALUE PER SEGMENT:
Net sales outside of segments									509.5	423.1	388.3
Mexican IMMSA Unit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									37.2	32.0	30.6
Mexican IMMSA Unit | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									71.9	82.1	66.5
Mexican IMMSA Unit | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales outside of segments									327.2	234.4	210.7
Mexican IMMSA Unit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									73.2	74.6	80.5
Peruvian Operations | Operating segment
SALES VALUE PER SEGMENT:
Net sales outside of segments									2,244.1	1,794.4	2,021.3
Peruvian Operations | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales outside of segments									1,996.4	1,557.7	1,756.9
Peruvian Operations | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales outside of segments									129.4	124.0	130.0
Peruvian Operations | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales outside of segments									70.6	61.5	57.2
Peruvian Operations | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales outside of segments									$ 47.7	$ 51.2	$ 77.2

X

- 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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