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SEGMENT AND RELATED INFORMATION: - Sales (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	$ 10,934.1	$ 7,984.9	$ 7,285.6
Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	8,828.3	6,513.1	5,845.3
Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	1,053.1	510.3	549.4
Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	289.5	249.4	277.8
Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	474.4	447.8	324.3
Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	288.8	264.3	288.8
Corporate, other and eliminations
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	(145.9)	(111.0)	(83.2)
Corporate, other and eliminations | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	(74.1)	(48.4)	(46.9)
Corporate, other and eliminations | Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	0.5	1.6	(2.3)
Corporate, other and eliminations | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	(64.1)	(55.5)	(29.9)
Corporate, other and eliminations | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	(8.2)	(8.7)	(4.1)
Mexican Open-Pit
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	6,109.0	4,412.4	3,963.9
Mexican Open-Pit | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	6,109.0	4,412.4	3,963.9
Mexican Open-Pit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	5,182.1	3,762.1	3,314.9
Mexican Open-Pit | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	538.4	275.2	341.0
Mexican Open-Pit | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	252.8	235.5	185.9
Mexican Open-Pit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	135.7	139.6	122.1
Mexican IMMSA Unit
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	600.2	529.9	464.8
Mexican IMMSA Unit | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	600.2	529.9	464.8
Mexican IMMSA Unit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	94.9	72.1	42.0
Mexican IMMSA Unit | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	289.0	247.8	280.1
Mexican IMMSA Unit | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	152.7	155.8	82.7
Mexican IMMSA Unit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	63.6	54.2	60.0
Peruvian Operations
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	4,370.8	3,153.6	2,940.1
Peruvian Operations | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	4,370.8	3,153.6	2,940.1
Peruvian Operations | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	3,625.4	2,727.3	2,535.3
Peruvian Operations | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	514.7	235.1	208.4
Peruvian Operations | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	133.0	112.0	85.6
Peruvian Operations | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	$ 97.7	$ 79.2	$ 110.8

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