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REVENUE: - Revenue by Geographical Areas (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue Recognition
Net sales	$ 1,753.4	$ 1,841.1
Corporate, other and eliminations
Revenue Recognition
Net sales	(19.9)	(19.6)
Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	1,072.1	1,068.6
Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	121.1	149.2
Peruvian Operations | Operating segment
Revenue Recognition
Net sales	580.1	642.9
Mexico
Revenue Recognition
Net sales	418.2	460.5
Mexico | Corporate, other and eliminations
Revenue Recognition
Net sales	(19.9)	(19.6)
Mexico | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	351.3	368.8
Mexico | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	86.8	111.3
United States
Revenue Recognition
Net sales	287.1	294.9
United States | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	279.0	248.4
United States | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	1.4	5.0
United States | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	6.7	41.5
Peru
Revenue Recognition
Net sales	87.3	93.5
Peru | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	1.6
Peru | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	85.7	93.5
Brazil
Revenue Recognition
Net sales	55.5	75.5
Brazil | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	7.2	12.6
Brazil | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	48.3	62.9
Chile
Revenue Recognition
Net sales	21.1	36.0
Chile | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	1.1
Chile | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	20.0	36.0
Other American countries
Revenue Recognition
Net sales	15.1	14.4
Other American countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	12.8	12.6
Other American countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.5	0.8
Other American countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	1.8	1.0
Switzerland
Revenue Recognition
Net sales	347.8	135.3
Switzerland | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	225.4	82.3
Switzerland | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	12.0	9.2
Switzerland | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	110.4	43.8
Italy
Revenue Recognition
Net sales	82.0	96.0
Italy | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	29.2	8.3
Italy | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	5.5	5.5
Italy | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	47.3	82.2
Spain
Revenue Recognition
Net sales	45.5	44.5
Spain | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	45.5	44.5
Other European Countries
Revenue Recognition
Net sales	82.6	82.1
Other European Countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	22.9	51.8
Other European Countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	5.8	4.6
Other European Countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	53.9	25.7
Singapore
Revenue Recognition
Net sales	112.9	276.4
Singapore | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	58.5	143.9
Singapore | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	1.8
Singapore | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	52.6	132.5
Japan
Revenue Recognition
Net sales	127.3	159.4
Japan | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	9.8	44.2
Japan | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	117.5	115.2
Other Asian countries
Revenue Recognition
Net sales	71.0	72.6
Other Asian countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	35.0	63.8
Other Asian countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.1	0.2
Other Asian countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 35.9	$ 8.6

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