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REVENUE RECOGNITION: - Revenue by Segment (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
Copper
REVENUE RECOGNITION
Net sales	1,473.4	1,285.8
Copper | Corporate, other and eliminations
REVENUE RECOGNITION
Net sales	(11.2)	(10.9)
Copper | Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	909.4	828.2
Copper | Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales	11.2	10.9
Copper | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	564.0	457.6
Molybdenum
REVENUE RECOGNITION
Net sales	136.3	92.8
Molybdenum | Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	91.0	53.9
Molybdenum | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	45.3	38.9
Zinc
REVENUE RECOGNITION
Net sales	94.9	79.0
Zinc | Corporate, other and eliminations
REVENUE RECOGNITION
Net sales	(0.1)	(0.3)
Zinc | Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales	95.0	79.3
Silver
REVENUE RECOGNITION
Net sales	71.1	73.8
Silver | Corporate, other and eliminations
REVENUE RECOGNITION
Net sales	(7.5)	(7.4)
Silver | Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	42.6	47.5
Silver | Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales	20.6	19.7
Silver | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	15.4	14.0
Other
REVENUE RECOGNITION
Net sales	65.4	52.5
Other | Corporate, other and eliminations
REVENUE RECOGNITION
Net sales	(0.8)	(2.0)
Other | Mexican Open-pit | Operating segment
REVENUE RECOGNITION
Net sales	25.6	22.6
Other | Mexican IMMSA Unit | Operating segment
REVENUE RECOGNITION
Net sales	22.4	20.9
Other | Peruvian Operations | Operating segment
REVENUE RECOGNITION
Net sales	$ 18.2	$ 11.0

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