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REVENUE: - Revenue by Geographical Areas (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue Recognition
Net sales	$ 1,859.5	$ 1,723.7	$ 5,431.0	$ 5,402.1
Corporate, other and eliminations
Revenue Recognition
Net sales	(18.6)	(17.2)	(63.9)	(55.6)
Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	982.4	995.1	3,009.1	3,124.9
Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	106.7	107.3	350.1	409.6
Peruvian Operations | Operating segment
Revenue Recognition
Net sales	789.0	638.5	2,135.7	1,923.2
Mexico
Revenue Recognition
Net sales	401.5	398.5	1,199.9	1,277.6
Mexico | Corporate, other and eliminations
Revenue Recognition
Net sales	(18.6)	(17.2)	(63.9)	(55.6)
Mexico | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	338.3	329.3	1,002.5	1,026.2
Mexico | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	81.8	86.4	261.3	307.0
United States
Revenue Recognition
Net sales	342.2	304.4	910.5	927.6
United States | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	280.4	263.1	817.3	782.4
United States | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	3.1	0.5	6.2	6.1
United States | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	58.7	40.8	87.0	139.1
Peru
Revenue Recognition
Net sales	75.2	92.6	255.6	292.7
Peru | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales			1.6
Peru | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	75.2	92.6	254.0	292.7
Brazil
Revenue Recognition
Net sales	49.7	62.5	154.9	212.0
Brazil | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	1.0	6.6	13.3	28.8
Brazil | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	48.7	55.9	141.6	183.2
Chile
Revenue Recognition
Net sales	64.5	42.4	144.9	102.1
Chile | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	0.1		1.3
Chile | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	64.4	42.4	143.6	102.1
Other American countries
Revenue Recognition
Net sales	11.2	15.7	39.2	45.7
Other American countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	10.1	15.2	34.1	41.6
Other American countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.7	0.5	2.0	2.9
Other American countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	0.4		3.1	1.2
Switzerland
Revenue Recognition
Net sales	263.9	179.6	872.7	480.1
Switzerland | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	171.1	141.4	579.4	340.4
Switzerland | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	11.3	6.8	28.4	33.9
Switzerland | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	81.5	31.4	264.9	105.8
Italy
Revenue Recognition
Net sales	62.3	72.8	218.6	259.6
Italy | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	5.7	5.1	42.7	18.2
Italy | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	2.0	3.4	10.3	16.8
Italy | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	54.6	64.3	165.6	224.6
Spain
Revenue Recognition
Net sales	46.7	42.0	139.0	130.7
Spain | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	46.7	42.0	139.0	130.7
Other European Countries
Revenue Recognition
Net sales	67.2	101.2	248.5	281.5
Other European Countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	24.8	74.0	70.3	195.7
Other European Countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	4.4	2.9	19.2	13.4
Other European Countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	38.0	24.3	159.0	72.4
Singapore
Revenue Recognition
Net sales	283.1	269.0	667.8	832.1
Singapore | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	68.0	104.9	198.5	389.0
Singapore | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	2.3		8.7
Singapore | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	212.8	164.1	460.6	443.1
Japan
Revenue Recognition
Net sales	127.9	109.3	387.9	401.9
Japan | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	21.3	(4.7)	37.3	68.7
Japan | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	106.6	114.0	350.6	333.2
Other Asian countries
Revenue Recognition
Net sales	64.1	33.7	191.5	158.5
Other Asian countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	15.9	24.8	85.1	132.0
Other Asian countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.1	0.2	0.7	0.7
Other Asian countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 48.1	$ 8.7	$ 105.7	$ 25.8

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-Publisher FASB
-Name Accounting Standards Codification
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