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INCOME TAXES: (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Taxes
Statutory income tax provision			$ 648.0	$ 698.5
GILTI tax				15.2
Peruvian royalty			8.6	6.7
Mexican royalty			47.6	60.9
Peruvian special mining tax			25.8	22.3
Total income tax provision	$ 241.0	$ 257.9	$ 730.0	$ 803.6
Effective income tax rate (as a percent)			38.20%	39.20%
Unrecognized tax benefits	69.5		$ 69.5		$ 214.5
Peru
Income Taxes
Peruvian royalty			8.6	$ 6.7
Royalty charges			31.7	24.2
Accrued special mining tax			25.8	22.3
Unrecognized tax benefits	0.0		0.0
Mexico
Income Taxes
Mexican royalty			47.6	$ 60.9
Unrecognized tax benefits	$ 0.0		$ 0.0

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- Definition

The amount of tax on global intangible low-taxed income (GILTI)

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Represents the 7.5% on earnings before taxes adjusted as defined by Mexican tax regulations

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Represents the amount of mining royalty in excess over the 1% of net sales.

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Represents the total mining royalty tax compute based on operating income or the 1% of net sales, the highest.

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Represents the special mining tax based on operating income.

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Represents the amount accrued for the special mining tax during the period.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of current and deferred federal income tax expense (benefit) attributable to income (loss) from continuing operations.

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