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INCOME TAXES: (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Taxes
Statutory income tax provision	$ 427.3	$ 207.4
Peruvian royalty	11.6	2.0
Mexican royalty	47.4	8.1
Peruvian special mining tax	21.2	4.2
Total income tax provision	$ 507.5	$ 221.7
Effective income tax rate (as a percent)	40.10%	50.80%
Peru
Income Taxes
Peruvian royalty	$ 11.6	$ 2.0
Royalty charges	21.3	9.3
Accrued special mining tax	21.2	4.2
Mexico
Income Taxes
Mexican royalty	$ 47.4	$ 8.1

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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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