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REVENUE: - Revenue by Geographical Areas (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
Mexico
Revenue Recognition
Net sales	493.9	436.0
Mexico | Corporate, other and eliminations
Revenue Recognition
Net sales	(26.1)	(26.8)
Mexico | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	453.4	363.6
Mexico | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	66.6	99.2
United States
Revenue Recognition
Net sales	425.5	299.3
United States | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	389.4	258.2
United States | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	17.0	0.2
United States | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	19.1	40.9
Peru
Revenue Recognition
Net sales	147.4	76.1
Peru | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales		3.0
Peru | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	147.4	73.1
Brazil
Revenue Recognition
Net sales	99.0	58.0
Brazil | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	2.0	3.5
Brazil | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	97.0	54.5
Chile
Revenue Recognition
Net sales	58.0	50.1
Chile | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	1.9	1.9
Chile | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	56.1	48.2
Other American countries
Revenue Recognition
Net sales	12.8	9.4
Other American countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	10.3	8.3
Other American countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.7	0.9
Other American countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	1.8	0.2
Switzerland
Revenue Recognition
Net sales	393.8	253.9
Switzerland | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	294.5	172.5
Switzerland | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	7.0	14.9
Switzerland | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	92.3	66.5
Italy
Revenue Recognition
Net sales	74.1	70.2
Italy | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.9	3.4
Italy | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	73.2	66.8
Spain
Revenue Recognition
Net sales	110.9	46.6
Spain | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	91.0	46.6
Spain | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	19.9
Other European Countries
Revenue Recognition
Net sales	180.9	79.3
Other European Countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	73.4	20.3
Other European Countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	26.5	6.1
Other European Countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	81.0	52.9
Singapore
Revenue Recognition
Net sales	202.3	200.7
Singapore | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	71.6	61.7
Singapore | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	3.6	3.2
Singapore | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	127.1	135.8
Japan
Revenue Recognition
Net sales	184.0	108.1
Japan | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	21.4	9.4
Japan | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	162.6	98.7
Other Asian countries
Revenue Recognition
Net sales	149.9	32.0
Other Asian countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	71.6	11.2
Other Asian countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales		0.1
Other Asian countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 78.3	$ 20.7

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