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REVENUE: - Revenue by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue Recognition
Net sales	$ 1,859.5	$ 1,723.7	$ 5,431.0	$ 5,402.1
Corporate, other and eliminations
Revenue Recognition
Net sales	(18.6)	(17.2)	(63.9)	(55.6)
Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	982.4	995.1	3,009.1	3,124.9
Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	106.7	107.3	350.1	409.6
Peruvian Operations | Operating segment
Revenue Recognition
Net sales	789.0	638.5	2,135.7	1,923.2
Copper
Revenue Recognition
Net sales	1,477.4	1,391.5	4,341.9	4,353.4
Copper | Corporate, other and eliminations
Revenue Recognition
Net sales	(11.0)	(10.0)	(38.2)	(32.2)
Copper | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	809.6	840.8	2,504.9	2,661.9
Copper | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	11.5	9.9	34.5	37.0
Copper | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	667.3	550.8	1,840.7	1,686.7
Molybdenum
Revenue Recognition
Net sales	156.5	137.6	429.4	378.5
Molybdenum | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	91.2	89.2	274.8	254.2
Molybdenum | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	65.3	48.4	154.6	124.3
Silver
Revenue Recognition
Net sales	88.6	71.7	234.1	226.0
Silver | Corporate, other and eliminations
Revenue Recognition
Net sales	(9.0)	(6.6)	(21.3)	(21.2)
Silver | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	49.8	42.5	137.6	133.2
Silver | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	24.7	19.0	59.1	63.4
Silver | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	23.1	16.8	58.7	50.6
Zinc
Revenue Recognition
Net sales	57.2	63.2	209.7	252.9
Zinc | Corporate, other and eliminations
Revenue Recognition
Net sales	2.6		(1.6)	(0.1)
Zinc | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	54.6	63.2	211.3	253.0
Other
Revenue Recognition
Net sales	79.8	59.7	215.9	191.3
Other | Corporate, other and eliminations
Revenue Recognition
Net sales	(1.2)	(0.6)	(2.8)	(2.1)
Other | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	31.8	22.6	91.8	75.6
Other | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	15.9	15.2	45.2	56.2
Other | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 33.3	$ 22.5	$ 81.7	$ 61.6

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 5
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