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REVENUE: - Revenue by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue Recognition
Net sales	$ 1,753.4	$ 1,841.1
Corporate, other and eliminations
Revenue Recognition
Net sales	(19.9)	(19.6)
Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	1,072.1	1,068.6
Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	121.1	149.2
Peruvian Operations | Operating segment
Revenue Recognition
Net sales	580.1	642.9
Copper
Revenue Recognition
Net sales	1,415.6	1,473.4
Copper | Corporate, other and eliminations
Revenue Recognition
Net sales	(12.9)	(11.2)
Copper | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	895.1	909.4
Copper | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	11.0	11.2
Copper | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	522.4	564.0
Molybdenum
Revenue Recognition
Net sales	118.3	136.3
Molybdenum | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	90.1	91.0
Molybdenum | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	28.2	45.3
Zinc
Revenue Recognition
Net sales	76.7	94.9
Zinc | Corporate, other and eliminations
Revenue Recognition
Net sales	(0.4)	(0.1)
Zinc | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	77.1	95.0
Silver
Revenue Recognition
Net sales	76.8	71.1
Silver | Corporate, other and eliminations
Revenue Recognition
Net sales	(5.8)	(7.5)
Silver | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	50.4	42.6
Silver | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	17.3	20.6
Silver | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	14.9	15.4
Other
Revenue Recognition
Net sales	66.0	65.4
Other | Corporate, other and eliminations
Revenue Recognition
Net sales	(0.8)	(0.8)
Other | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	36.5	25.6
Other | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	15.7	22.4
Other | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 14.6	$ 18.2

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