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REVENUE RECOGNITION: - Revenue by Geographical Areas (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue Recognition
Net sales	$ 1,837.2	$ 1,529.8	$ 3,678.4	$ 3,113.8
Corporate, other and eliminations
Revenue Recognition
Net sales	(18.8)	(17.6)	(38.4)	(38.1)
Mexican Open-pit
Revenue Recognition
Net sales	1,061.1	899.8	2,129.7	1,852.0
Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	1,061.1	899.8	2,129.7	1,852.0
Mexican IMMSA Unit
Revenue Recognition
Net sales	134.3	107.3	264.0	217.6
Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	153.1	124.9	302.4	255.7
Peruvian Operations
Revenue Recognition
Net sales	641.8	522.7	1,284.7	1,044.2
Peruvian Operations | Operating segment
Revenue Recognition
Net sales	641.8	522.7	1,284.7	1,044.2
Mexico
Revenue Recognition
Net sales	418.6	335.7	879.2	704.2
Mexico | Corporate, other and eliminations
Revenue Recognition
Net sales	(18.8)	(17.6)	(38.4)	(38.1)
Mexico | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	328.1	263.6	696.9	564.1
Mexico | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	109.3	87.5	220.7	176.0
Mexico | Peruvian Operations | Operating segment
Revenue Recognition
Net sales		2.2		2.2
United States
Revenue Recognition
Net sales	328.4	242.4	623.2	542.7
United States | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	270.9	194.1	519.3	460.7
United States | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.6	11.9	5.5	23.6
United States | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	56.9	36.4	98.4	58.4
Peru
Revenue Recognition
Net sales	106.5	82.8	200.0	170.7
Peru | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales		0.4		0.8
Peru | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	106.5	82.4	200.0	169.9
Brazil
Revenue Recognition
Net sales	74.1	55.9	149.6	113.3
Brazil | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	9.7	12.1	22.3	24.0
Brazil | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	64.4	43.8	127.3	89.3
Chile
Revenue Recognition
Net sales	23.6	18.1	59.6	51.3
Chile | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	23.6	18.1	59.6	51.3
Other American countries
Revenue Recognition
Net sales	15.6	15.0	29.9	39.1
Other American countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	13.8	14.2	26.4	31.1
Other American countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	1.6	0.7	2.3	1.7
Other American countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	0.2	0.1	1.2	6.3
Switzerland
Revenue Recognition
Net sales	165.1	160.7	300.5	257.6
Switzerland | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	116.7	134.5	199.0	225.7
Switzerland | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	17.8	2.5	27.1	5.8
Switzerland | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	30.6	23.7	74.4	26.1
Italy
Revenue Recognition
Net sales	90.8	78.6	186.9	166.2
Italy | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	4.7	8.5	13.1	14.2
Italy | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	8.0	3.4	13.5	8.5
Italy | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	78.1	66.7	160.3	143.5
Spain
Revenue Recognition
Net sales	44.2	35.2	88.7	65.4
Spain | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	44.2	35.2	88.7	65.4
Other European Countries
Revenue Recognition
Net sales	98.1	101.0	180.3	177.2
Other European Countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	69.9	77.1	121.7	127.3
Other European Countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	5.8	6.4	10.5	13.6
Other European Countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	22.4	17.5	48.1	36.3
Singapore
Revenue Recognition
Net sales	286.8	241.5	563.1	520.1
Singapore | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	140.2	114.0	284.1	255.6
Singapore | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales		(0.1)		1.4
Singapore | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	146.6	127.6	279.0	263.1
Japan
Revenue Recognition
Net sales	133.1	101.2	292.6	216.7
Japan | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	29.1	8.1	73.3	34.6
Japan | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	104.0	93.1	219.3	182.1
Other Asian countries
Revenue Recognition
Net sales	52.3	61.7	124.8	89.3
Other Asian countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	43.5	50.5	107.2	73.3
Other Asian countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.3	0.1	0.5	0.3
Other Asian countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 8.5	$ 11.1	$ 17.1	$ 15.7

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