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REVENUE: - Revenue by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue Recognition
Net sales	$ 2,532.5	$ 1,719.7
Corporate, other and eliminations
Revenue Recognition
Net sales	(26.1)	(26.8)
Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	1,478.5	953.7
Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	124.3	134.5
Peruvian Operations | Operating segment
Revenue Recognition
Net sales	955.8	658.3
Copper
Revenue Recognition
Net sales	2,117.4	1,365.8
Copper | Corporate, other and eliminations
Revenue Recognition
Net sales	(13.7)	(12.9)
Copper | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	1,280.5	799.7
Copper | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	23.8	18.0
Copper | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	826.8	561.0
Molybdenum
Revenue Recognition
Net sales	169.6	126.1
Molybdenum | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	91.1	72.0
Molybdenum | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	78.5	54.1
Silver
Revenue Recognition
Net sales	139.0	64.9
Silver | Corporate, other and eliminations
Revenue Recognition
Net sales	(11.7)	(0.5)
Silver | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	72.7
Silver | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	48.5	65.4
Silver | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	29.5
Zinc
Revenue Recognition
Net sales	35.7	88.1
Zinc | Corporate, other and eliminations
Revenue Recognition
Net sales	0.5	(11.9)
Zinc | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales		44.6
Zinc | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	35.2	35.4
Zinc | Peruvian Operations | Operating segment
Revenue Recognition
Net sales		20.0
Other
Revenue Recognition
Net sales	70.8	74.8
Other | Corporate, other and eliminations
Revenue Recognition
Net sales	(1.2)	(1.5)
Other | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	34.2	37.4
Other | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	16.8	15.7
Other | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 21.0	$ 23.2

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