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INCOME TAXES: (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2017
Income Taxes
Statutory income tax provision			$ 473.0	$ 268.5
Peruvian royalty			0.5
Mexican royalty			67.7	29.4
Peruvian special mining tax			15.4	7.5
Total income tax provision	$ 220.1	$ 111.2	$ 556.6	$ 305.4
Effective income tax rate (as a percent)			35.70%	34.10%
Changes in the entity's uncertain tax positions	$ 0.0		$ 0.0
Peru
Income Taxes
Peruvian royalty			$ 0.5	$ 0.0
Increment in operating income margin for royalty tax (as a percent)			5.00%
Increase in royalty tax rate for each 5% increase up to 12% increase in operating income margin (as a percent)			0.75%
Royalty charges			$ 15.4	12.2
Increase in special mining tax rate for each 5% increase up to 85% increase in operating income margin (as a percent)			0.40%
Increment in operating income margin (as a percent)			5.00%
Accrued special mining tax			$ 15.4	7.5
Peru | Minimum
Income Taxes
Mining royalty tax (as a percent)			1.00%
Royalty charge assessed as a percentage of net sales			1.00%
Special mine tax (as a percent)			2.00%
Increment in operating income margin (as a percent)			2.00%
Peru | Maximum
Income Taxes
Mining royalty tax (as a percent)			12.00%
Operating income margin for royalty tax (as a percent)			10.00%
Increment in operating income margin for royalty tax (as a percent)			12.00%
Special mine tax (as a percent)			8.40%
Operating income margin (as a percent)			10.00%
Increment in operating income margin (as a percent)			85.00%
Mexico
Income Taxes
Mexican royalty			$ 67.7	$ 29.4
Mining royalty tax (as a percent)			7.50%
Additional royalty tax over net sales from sales of gold, silver and platinum (as a percent)			0.50%
Forecast
Income Taxes
Unrecognized tax benefits					$ 153.0
2016 | Peru
Income Taxes
Income Tax Rate (as a percent )			28.00%
Dividend Tax Rate (as a percent )			6.80%
2017 and later | Peru
Income Taxes
Income Tax Rate (as a percent )			29.50%
Dividend Tax Rate (as a percent )			5.00%

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