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REVENUE RECOGNITION: - Revenue by Geographical Areas (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue Recognition
Net sales	$ 1,723.7	$ 1,676.5	$ 5,402.1	$ 4,790.2
Corporate, other and eliminations
Revenue Recognition
Net sales	(17.2)	(16.0)	(55.6)	(54.1)
Mexican Open-pit
Revenue Recognition
Net sales	995.1	1,023.3	3,124.9	2,875.3
Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	995.1	1,023.3	3,124.9	2,875.3
Mexican IMMSA Unit
Revenue Recognition
Net sales	90.1	87.5	354.0	305.0
Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	107.3	103.5	409.6	359.1
Peruvian Operations
Revenue Recognition
Net sales	638.5	565.7	1,923.2	1,609.9
Peruvian Operations | Operating segment
Revenue Recognition
Net sales	638.5	565.7	1,923.2	1,609.9
Mexico
Revenue Recognition
Net sales	398.5	396.9	1,277.6	1,101.3
Mexico | Corporate, other and eliminations
Revenue Recognition
Net sales	(17.2)	(16.0)	(55.6)	(54.1)
Mexico | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	329.3	332.9	1,026.2	897.1
Mexico | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	86.4	77.2	307.0	253.2
Mexico | Peruvian Operations | Operating segment
Revenue Recognition
Net sales		2.8		5.1
United States
Revenue Recognition
Net sales	304.4	329.9	927.6	872.5
United States | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	263.1	272.3	782.4	733.0
United States | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.5	10.1	6.1	33.7
United States | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	40.8	47.5	139.1	105.8
Peru
Revenue Recognition
Net sales	92.6	94.5	292.7	265.2
Peru | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales				0.8
Peru | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	92.6	94.5	292.7	264.4
Brazil
Revenue Recognition
Net sales	62.5	58.5	212.0	171.8
Brazil | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	6.6	5.7	28.8	29.7
Brazil | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	55.9	52.8	183.2	142.1
Chile
Revenue Recognition
Net sales	42.4	26.5	102.1	77.8
Chile | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	42.4	26.5	102.1	77.8
Other American countries
Revenue Recognition
Net sales	15.7	26.7	45.7	65.8
Other American countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	15.2	19.4	41.6	50.5
Other American countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.5	0.7	2.9	2.4
Other American countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales		6.6	1.2	12.9
Switzerland
Revenue Recognition
Net sales	179.6	121.9	480.1	379.6
Switzerland | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	141.4	91.1	340.4	316.9
Switzerland | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	6.8	1.8	33.9	7.6
Switzerland | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	31.4	29.0	105.8	55.1
Italy
Revenue Recognition
Net sales	72.8	73.9	259.6	240.0
Italy | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	5.1	7.9	18.2	22.2
Italy | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	3.4	3.7	16.8	12.1
Italy | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	64.3	62.3	224.6	205.7
Spain
Revenue Recognition
Net sales	42.0	34.8	130.7	100.2
Spain | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	42.0	34.8	130.7	100.2
Other European Countries
Revenue Recognition
Net sales	101.2	58.7	281.5	235.9
Other European Countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	74.0	35.1	195.7	162.4
Other European Countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	2.9	4.2	13.4	17.8
Other European Countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	24.3	19.4	72.4	55.7
Singapore
Revenue Recognition
Net sales	269.0	287.5	832.1	807.6
Singapore | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	104.9	172.1	389.0	427.6
Singapore | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales				1.4
Singapore | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	164.1	115.4	443.1	378.6
Japan
Revenue Recognition
Net sales	109.3	134.4	401.9	351.0
Japan | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	(4.7)	35.5	68.7	70.0
Japan | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	114.0	98.9	333.2	281.0
Other Asian countries
Revenue Recognition
Net sales	33.7	32.3	158.5	121.5
Other Asian countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	24.8	22.2	132.0	95.4
Other Asian countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.2	0.1	0.7	0.4
Other Asian countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 8.7	$ 10.0	$ 25.8	$ 25.7

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