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INCOME TAXES: - Other (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018
Income Taxes
Peruvian special mining tax		$ 18.2	$ 14.6
Changes in unrecognized tax benefits
Unrecognized tax benefits, opening balance		214.5
Decreases related to settlements with taxing authorities	$ 145.0
Unrecognized tax benefits, ending balance	69.5	$ 69.5
Peru
Income Taxes
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		$ 19.8	$ 15.9
Increment in operating income margin (as a percent)		5.00%
Increase in special mining tax rate for each 5% increase up to 85% increase in operating income margin (as a percent)		0.40%
Changes in unrecognized tax benefits
Unrecognized tax benefits, ending balance	0.0	$ 0.0
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%
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
Mining royalty tax (as a percent)		7.50%
Changes in unrecognized tax benefits
Unrecognized tax benefits, ending balance	$ 0.0	$ 0.0

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Amount of unrecognized tax benefits.

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