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REVENUE RECOGNITION: - Revenue by Geographical Areas (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
REVENUE RECOGNITION
Net sales	$ 1,841.1	$ 1,583.9
Corporate, other and eliminations
REVENUE RECOGNITION
Net sales	(19.6)	(20.6)
Mexican Open-pit
REVENUE RECOGNITION
Net sales	1,068.6	952.2
Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	1,068.6	952.2
Mexican IMMSA Unit
REVENUE RECOGNITION
Net sales	129.6	110.2
Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales	149.2	130.8
Peruvian Operations
REVENUE RECOGNITION
Net sales	642.9	521.5
Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	642.9	521.5
Mexico
REVENUE RECOGNITION
Net sales	460.5	368.4
Mexico | Corporate, other and eliminations
REVENUE RECOGNITION
Net sales	(19.6)	(20.6)
Mexico | Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	368.8	300.5
Mexico | Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales	111.3	88.5
United States
REVENUE RECOGNITION
Net sales	294.9	300.4
United States | Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	248.4	266.6
United States | Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales	5.0	11.7
United States | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	41.5	22.1
Peru
REVENUE RECOGNITION
Net sales	93.5	87.9
Peru | Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales		0.5
Peru | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	93.5	87.4
Brazil
REVENUE RECOGNITION
Net sales	75.5	57.4
Brazil | Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales	12.6	11.9
Brazil | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	62.9	45.5
Chile
REVENUE RECOGNITION
Net sales	36.0	33.2
Chile | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	36.0	33.2
Other American countries
REVENUE RECOGNITION
Net sales	14.4	24.0
Other American countries | Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	12.6	16.8
Other American countries | Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales	0.8	1.0
Other American countries | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	1.0	6.2
Switzerland
REVENUE RECOGNITION
Net sales	135.3	97.1
Switzerland | Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	82.3	91.3
Switzerland | Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales	9.2	3.3
Switzerland | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	43.8	2.5
Italy
REVENUE RECOGNITION
Net sales	96.0	87.6
Italy | Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	8.3	5.8
Italy | Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales	5.5	5.1
Italy | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	82.2	76.7
Spain
REVENUE RECOGNITION
Net sales	44.5	30.2
Spain | Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	44.5	30.2
Other European Countries
REVENUE RECOGNITION
Net sales	82.1	76.1
Other European Countries | Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	51.8	50.2
Other European Countries | Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales	4.6	7.2
Other European Countries | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	25.7	18.7
Singapore
REVENUE RECOGNITION
Net sales	276.4	278.6
Singapore | Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	143.9	141.6
Singapore | Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales		1.5
Singapore | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	132.5	135.5
Japan
REVENUE RECOGNITION
Net sales	159.4	115.5
Japan | Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	44.2	26.4
Japan | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	115.2	89.1
Other Asian countries
REVENUE RECOGNITION
Net sales	72.6	27.5
Other Asian countries | Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	63.8	22.8
Other Asian countries | Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales	0.2	0.1
Other Asian countries | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	$ 8.6	$ 4.6

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