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INCOME TAXES: - Carryforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Foreign tax credits
Other U.S. tax credits		$ 0.0
Unrecognized Tax Benefits		$ 214.5	$ 304.0	$ 400.0	$ 319.4
Income Tax Rate (as a percent)		35.00%	35.00%	35.00%
Forecast
Foreign tax credits
Income Tax Rate (as a percent)	21.00%
United States | Forecast
Foreign tax credits
Income Tax Rate (as a percent)	21.00%
Mexico
Foreign tax credits
Unrecognized Tax Benefits		$ 0.0
Income Tax Rate (as a percent)		30.00%	30.00%	30.00%
Mexico | Forecast | Minimum
Foreign tax credits
Income Tax Rate (as a percent)	30.00%
Peru
Foreign tax credits
Unrecognized Tax Benefits		$ 0.0
Income Tax Rate (as a percent)		29.50%	28.00%	28.00%
Peru | Forecast | Minimum
Foreign tax credits
Income Tax Rate (as a percent)	30.00%
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		205.7
Foreign tax credit carryforward		485.8
Foreign tax credit carryforward net of unrecognized tax benefit		280.2
2022 | Foreign
Foreign tax credits
Foreign tax credit carryforward		20.3
2023 | Foreign
Foreign tax credits
Foreign tax credit carryforward		69.2
2024 | Foreign
Foreign tax credits
Foreign tax credit carryforward		102.0
2025 | Foreign
Foreign tax credits
Foreign tax credit carryforward		189.5
2026 | Foreign
Foreign tax credits
Foreign tax credit carryforward		$ 104.8

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