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SEGMENT AND RELATED INFORMATION: - Sales (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)	$ 1,854.7	$ 1,859.5	$ 1,818.0	$ 1,753.4	$ 1,694.7	$ 1,723.7	$ 1,837.2	$ 1,841.1	$ 7,285.6	$ 7,096.7	$ 6,654.5
Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									5,845.3	5,707.8	5,476.5
Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									549.4	509.9	353.4
Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									277.8	328.6	286.3
Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									324.3	300.2	326.6
Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									288.8	250.2	211.7
Corporate, other and eliminations
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									(83.2)	(79.3)	(71.8)
Corporate, other and eliminations | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									(46.9)	(48.1)	(37.3)
Corporate, other and eliminations | Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									(2.3)	(0.1)	(26.9)
Corporate, other and eliminations | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									(29.9)	(28.1)	(0.6)
Corporate, other and eliminations | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									(4.1)	(3.0)	(7.0)
Mexican Open-pit
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									3,963.9	4,075.9	3,972.7
Mexican Open-pit | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									3,963.9	4,075.9	3,972.7
Mexican Open-pit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									3,314.9	3,459.1	3,480.2
Mexican Open-pit | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									341.0	342.5	224.0
Mexican Open-pit | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)											170.7
Mexican Open-pit | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									185.9	175.3
Mexican Open-pit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									122.1	99.0	97.8
Mexican IMMSA Unit
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									464.8	527.9	509.5
Mexican IMMSA Unit | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									464.8	527.9	509.5
Mexican IMMSA Unit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									42.0	45.6	37.2
Mexican IMMSA Unit | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									280.1	328.7	71.9
Mexican IMMSA Unit | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									82.7	83.5	327.2
Mexican IMMSA Unit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									60.0	70.1	73.2
Peruvian Operations
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									2,940.1	2,572.2	2,244.1
Peruvian Operations | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									2,940.1	2,572.2	2,244.1
Peruvian Operations | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									2,535.3	2,251.2	1,996.4
Peruvian Operations | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									208.4	167.4	129.4
Peruvian Operations | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)											70.6
Peruvian Operations | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									85.6	69.5
Peruvian Operations | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see Note 17)									$ 110.8	$ 84.1	$ 47.7

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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