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INCOME TAXES: - Carryforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Foreign tax credits
Other U.S. tax credits	$ 0.0
Unrecognized Tax Benefits	$ 58.4	$ 214.5	$ 214.5	$ 304.0
Income Tax Rate (as a percent)	21.00%	21.00%	35.00%
Mexico
Foreign tax credits
Unrecognized Tax Benefits	$ 0.0
Income Tax Rate (as a percent)	30.00%	30.00%	30.00%
Peru
Foreign tax credits
Income Tax Rate (as a percent)	29.50%	29.50%	29.50%
Foreign
Foreign tax credits
Tax credits carryback period	1 year
Tax credits carryforward period	10 years
Increase in foreign tax credits	$ 15.9
Unrecognized Tax Benefits	58.4
Foreign tax credit carryforward	790.2
Foreign tax credit carryforward net of unrecognized tax benefit	731.8
2024 | Foreign
Foreign tax credits
Foreign tax credit carryforward	39.4
2025 | Foreign
Foreign tax credits
Foreign tax credit carryforward	102.0
2026 | Foreign
Foreign tax credits
Foreign tax credit carryforward	189.5
2027 | Foreign
Foreign tax credits
Foreign tax credit carryforward	105.6
2028 | Foreign
Foreign tax credits
Foreign tax credit carryforward	159.6
2030 | Foreign
Foreign tax credits
Foreign tax credit carryforward	$ 194.1

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