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SEGMENT AND RELATED INFORMATION: - Sales (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	$ 7,984.9	$ 7,285.6	$ 7,096.7
Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	6,513.1	5,845.3	5,707.8
Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	510.3	549.4	509.9
Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	249.4	277.8	328.6
Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	447.8	324.3	300.2
Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	264.3	288.8	250.2
Corporate, other and eliminations
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	(111.0)	(83.2)	(79.3)
Corporate, other and eliminations | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	(48.4)	(46.9)	(48.1)
Corporate, other and eliminations | Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	1.6	(2.3)	(0.1)
Corporate, other and eliminations | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	(55.5)	(29.9)	(28.1)
Corporate, other and eliminations | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	(8.7)	(4.1)	(3.0)
Mexican Open-pit
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	4,412.4	3,963.9	4,075.9
Mexican Open-pit | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	4,412.4	3,963.9	4,075.9
Mexican Open-pit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	3,762.1	3,314.9	3,459.1
Mexican Open-pit | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	275.2	341.0	342.5
Mexican Open-pit | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	235.5	185.9	175.3
Mexican Open-pit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	139.6	122.1	99.0
Mexican IMMSA Unit
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	529.9	464.8	527.9
Mexican IMMSA Unit | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	529.9	464.8	527.9
Mexican IMMSA Unit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	72.1	42.0	45.6
Mexican IMMSA Unit | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	247.8	280.1	328.7
Mexican IMMSA Unit | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	155.8	82.7	83.5
Mexican IMMSA Unit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	54.2	60.0	70.1
Peruvian Operations
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	3,153.6	2,940.1	2,572.2
Peruvian Operations | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	3,153.6	2,940.1	2,572.2
Peruvian Operations | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	2,727.3	2,535.3	2,251.2
Peruvian Operations | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	235.1	208.4	167.4
Peruvian Operations | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	112.0	85.6	69.5
Peruvian Operations | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	$ 79.2	$ 110.8	$ 84.1

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