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REVENUE: - Revenue by Geographical Areas (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
Mexico
Revenue Recognition
Net sales	624.6	493.9
Mexico | Corporate, other and eliminations
Revenue Recognition
Net sales	(40.0)	(26.1)
Mexico | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	533.8	453.4
Mexico | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	130.8	66.6
United States
Revenue Recognition
Net sales	562.1	425.5
United States | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	455.6	389.4
United States | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	15.7	17.0
United States | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	90.8	19.1
Peru
Revenue Recognition
Net sales	177.8	147.4
Peru | Corporate, other and eliminations
Revenue Recognition
Net sales	(114.7)
Peru | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	115.0
Peru | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	177.5	147.4
Brazil
Revenue Recognition
Net sales	124.3	99.0
Brazil | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	5.2	2.0
Brazil | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	119.1	97.0
Chile
Revenue Recognition
Net sales	103.5	58.0
Chile | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales		1.9
Chile | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	103.5	56.1
Other American countries
Revenue Recognition
Net sales	11.9	12.8
Other American countries | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	6.5	10.3
Other American countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales		0.7
Other American countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	5.4	1.8
Switzerland
Revenue Recognition
Net sales	426.8	393.8
Switzerland | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	227.4	294.5
Switzerland | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	8.3	7.0
Switzerland | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	191.1	92.3
Italy
Revenue Recognition
Net sales	72.0	74.1
Italy | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	0.5
Italy | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	4.0	0.9
Italy | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	67.5	73.2
Spain
Revenue Recognition
Net sales	94.9	110.9
Spain | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	93.2	91.0
Spain | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	1.7	19.9
Other European Countries
Revenue Recognition
Net sales	125.3	180.9
Other European Countries | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	30.8	73.4
Other European Countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	8.4	26.5
Other European Countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	86.1	81.0
China
Revenue Recognition
Net sales	112.4	56.6
China | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	112.4	55.0
China | Peruvian Operations | Operating segment
Revenue Recognition
Net sales		1.9
Singapore
Revenue Recognition
Net sales	61.8	202.3
Singapore | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	4.7	71.6
Singapore | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	4.9	3.6
Singapore | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	52.2	127.1
Japan
Revenue Recognition
Net sales	183.4	184.0
Japan | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	22.0	21.4
Japan | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	161.4	162.6
Other Asian countries
Revenue Recognition
Net sales	83.0	93.3
Other Asian countries | Mexican Open-Pit | Operating segment
Revenue Recognition
Net sales	44.3	16.9
Other Asian countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.2
Other Asian countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 38.5	$ 76.4

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