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SUBSEQUENT EVENTS: (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended								12 Months Ended
	Feb. 26, 2019	Feb. 21, 2019	Jan. 24, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SUBSEQUENT EVENTS
Dividend per share				$ 0.40	$ 0.40	$ 0.30	$ 0.30	$ 0.25	$ 0.14	$ 0.12	$ 0.08	$ 1.40	$ 0.59	$ 0.18
Subsequent Events
SUBSEQUENT EVENTS
Quarterly dividend authorized (in dollars per share)			$ 0.40
Dividend per share	$ 0.40
Subsequent Events | Grupo Mexico and Americas Mining
SUBSEQUENT EVENTS
Dividend per share		$ 0.44428
Settlement dividend paid		$ 36.5
Legal fees paid		$ 13.5

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- Definition

The total amount of settlement dividend paid to shareholders other than Defendants.

+ References

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Aggregate dividends declared during the period for each share of common stock outstanding.

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The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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