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REVENUE: - Revenue by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue Recognition
Net sales	$ 2,763.8	$ 2,532.5
Corporate, other and eliminations
Revenue Recognition
Net sales	(154.7)	(26.1)
Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	1,646.2	1,478.5
Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	177.5	124.3
Peruvian Operations | Operating segment
Revenue Recognition
Net sales	1,094.8	955.8
Copper
Revenue Recognition
Net sales	2,154.9	2,117.4
Copper | Corporate, other and eliminations
Revenue Recognition
Net sales	(129.8)	(13.7)
Copper | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	1,368.4	1,280.5
Copper | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	22.4	23.8
Copper | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	893.9	826.8
Molybdenum
Revenue Recognition
Net sales	275.8	169.6
Molybdenum | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	150.4	91.1
Molybdenum | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	125.4	78.5
Silver
Revenue Recognition
Net sales	105.2	35.7
Silver | Corporate, other and eliminations
Revenue Recognition
Net sales	(21.6)	0.5
Silver | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	66.7
Silver | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	37.0	35.2
Silver | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	23.1
Zinc
Revenue Recognition
Net sales	98.3	139.0
Zinc | Corporate, other and eliminations
Revenue Recognition
Net sales	(0.3)	(11.7)
Zinc | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales		72.7
Zinc | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	98.6	48.5
Zinc | Peruvian Operations | Operating segment
Revenue Recognition
Net sales		29.5
Other
Revenue Recognition
Net sales	129.6	70.8
Other | Corporate, other and eliminations
Revenue Recognition
Net sales	(3.0)	(1.2)
Other | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	60.7	34.2
Other | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	19.5	16.8
Other | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 52.4	$ 21.0

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