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REVENUE: - Revenue by Geographical Areas (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue Recognition
Net sales	$ 1,818.0	$ 1,837.2	$ 3,571.4	$ 3,678.4
Corporate, other and eliminations
Revenue Recognition
Net sales	(25.4)	(18.8)	(45.3)	(38.4)
Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	954.6	1,061.1	2,026.7	2,129.7
Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	122.3	153.1	243.4	302.4
Peruvian Operations | Operating segment
Revenue Recognition
Net sales	766.5	641.8	1,346.6	1,284.7
Mexico
Revenue Recognition
Net sales	380.2	418.6	798.4	879.2
Mexico | Corporate, other and eliminations
Revenue Recognition
Net sales	(25.4)	(18.8)	(45.3)	(38.4)
Mexico | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	312.9	328.1	664.2	696.9
Mexico | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	92.7	109.3	179.5	220.7
United States
Revenue Recognition
Net sales	281.1	328.4	568.2	623.2
United States | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	257.9	270.9	536.9	519.3
United States | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	1.6	0.6	3.0	5.5
United States | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	21.6	56.9	28.3	98.4
Peru
Revenue Recognition
Net sales	93.0	106.5	180.3	200.0
Peru | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales			1.6
Peru | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	93.0	106.5	178.7	200.0
Brazil
Revenue Recognition
Net sales	49.7	74.1	105.2	149.6
Brazil | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	5.1	9.7	12.3	22.3
Brazil | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	44.6	64.4	92.9	127.3
Chile
Revenue Recognition
Net sales	59.3	23.6	80.3	59.6
Chile | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales			1.1
Chile | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	59.3	23.6	79.2	59.6
Other American countries
Revenue Recognition
Net sales	12.9	15.6	28.0	29.9
Other American countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	11.3	13.8	24.1	26.4
Other American countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.8	1.6	1.2	2.3
Other American countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	0.8	0.2	2.7	1.2
Switzerland
Revenue Recognition
Net sales	261.1	165.1	608.8	300.5
Switzerland | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	183.0	116.7	408.3	199.0
Switzerland | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	5.1	17.8	17.1	27.1
Switzerland | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	73.0	30.6	183.4	74.4
Italy
Revenue Recognition
Net sales	74.3	90.8	156.3	186.9
Italy | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	7.8	4.7	37.0	13.1
Italy | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	2.8	8.0	8.3	13.5
Italy | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	63.7	78.1	111.0	160.3
Spain
Revenue Recognition
Net sales	46.8	44.2	92.3	88.7
Spain | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	46.8	44.2	92.3	88.7
Other European Countries
Revenue Recognition
Net sales	98.5	98.1	181.3	180.3
Other European Countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	22.4	69.9	45.4	121.7
Other European Countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	9.0	5.8	14.9	10.5
Other European Countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	67.1	22.4	121.0	48.1
Singapore
Revenue Recognition
Net sales	272.1	286.8	384.8	563.1
Singapore | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	72.1	140.2	130.6	284.1
Singapore | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	4.7		6.4
Singapore | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	195.3	146.6	247.8	279.0
Japan
Revenue Recognition
Net sales	132.7	133.1	260.1	292.6
Japan | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	6.3	29.1	16.1	73.3
Japan | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	126.4	104.0	244.0	219.3
Other Asian countries
Revenue Recognition
Net sales	56.3	52.3	127.4	124.8
Other Asian countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	34.1	43.5	69.1	107.2
Other Asian countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.5	0.3	0.7	0.5
Other Asian countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 21.7	$ 8.5	$ 57.6	$ 17.1

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