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REVENUE: - Revenue by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue Recognition
Net sales	$ 2,156.9	$ 2,680.9	$ 7,227.6	$ 8,110.4
Corporate, other and eliminations
Revenue Recognition
Net sales	(19.5)	(42.8)	(281.5)	(107.9)
Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	1,201.5	1,425.8	4,184.7	4,536.6
Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	159.2	175.1	503.0	460.8
Peruvian Operations | Operating segment
Revenue Recognition
Net sales	815.7	1,122.8	2,821.4	3,220.9
Copper
Revenue Recognition
Net sales	1,610.0	2,110.4	5,562.7	6,576.1
Copper | Corporate, other and eliminations
Revenue Recognition
Net sales	(3.1)	(21.8)	(215.0)	(54.7)
Copper | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	950.4	1,195.0	3,432.8	3,858.2
Copper | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	11.9	24.3	62.3	75.5
Copper | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	650.8	912.9	2,282.6	2,697.1
Molybdenum
Revenue Recognition
Net sales	212.6	294.5	686.6	746.3
Molybdenum | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	131.9	146.6	388.1	387.3
Molybdenum | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	80.7	147.9	298.5	359.0
Silver
Revenue Recognition
Net sales	87.6	98.7	292.2	215.6
Silver | Corporate, other and eliminations
Revenue Recognition
Net sales	(14.2)	0.1	(56.6)	0.5
Silver | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	53.8		178.6
Silver | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	28.0	98.6	101.8	215.1
Silver | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	20.0		68.4
Zinc
Revenue Recognition
Net sales	101.0	104.2	280.6	363.4
Zinc | Corporate, other and eliminations
Revenue Recognition
Net sales	0.1	(19.0)	(0.9)	(48.1)
Zinc | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales		52.4		193.1
Zinc | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	100.9	37.2	281.5	122.6
Zinc | Peruvian Operations | Operating segment
Revenue Recognition
Net sales		33.6		95.8
Other
Revenue Recognition
Net sales	145.7	73.1	405.5	209.0
Other | Corporate, other and eliminations
Revenue Recognition
Net sales	(2.3)	(2.1)	(9.0)	(5.6)
Other | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	65.4	31.8	185.2	98.0
Other | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	18.4	15.0	57.4	47.6
Other | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 64.2	$ 28.4	$ 171.9	$ 69.0

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