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REVENUE: - Revenue by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue Recognition
Net sales	$ 2,793.9	$ 2,763.8
Corporate, other and eliminations
Revenue Recognition
Net sales	(38.2)	(154.7)
Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	1,626.9	1,646.2
Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	179.5	177.5
Peruvian Operations | Operating segment
Revenue Recognition
Net sales	1,025.7	1,094.8
Copper
Revenue Recognition
Net sales	2,147.9	2,154.9
Copper | Corporate, other and eliminations
Revenue Recognition
Net sales	(17.1)	(129.8)
Copper | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	1,340.6	1,368.4
Copper | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	19.5	22.4
Copper | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	804.9	893.9
Molybdenum
Revenue Recognition
Net sales	301.6	275.8
Molybdenum | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	160.7	150.4
Molybdenum | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	140.9	125.4
Silver
Revenue Recognition
Net sales	115.1	98.3
Silver | Corporate, other and eliminations
Revenue Recognition
Net sales	(18.5)	(0.3)
Silver | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	65.3
Silver | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	42.8	98.6
Silver | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	25.5
Zinc
Revenue Recognition
Net sales	92.1	105.2
Zinc | Corporate, other and eliminations
Revenue Recognition
Net sales	0.6	(21.6)
Zinc | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales		66.7
Zinc | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	91.5	37.0
Zinc | Peruvian Operations | Operating segment
Revenue Recognition
Net sales		23.1
Other
Revenue Recognition
Net sales	137.2	129.6
Other | Corporate, other and eliminations
Revenue Recognition
Net sales	(3.2)	(3.0)
Other | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	60.3	60.7
Other | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	25.7	19.5
Other | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 54.4	$ 52.4

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