INCOME TAXES: - Carryforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Foreign tax credits
Other U.S. tax credits	$ 0.0
Unrecognized Tax Benefits	$ 111.0	$ 56.0		$ 66.1
Income Tax Rate (as a percent)	21.00%	21.00%	21.00%
United States
Foreign tax credits
Unrecognized Tax Benefits	$ 0.2
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
Unrecognized Tax Benefits	$ 46.4
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
Unrecognized Tax Benefits	$ 11.7
Foreign tax credit carryforward	1,915.8
Foreign tax credit carryforward net of unrecognized tax benefit	1,904.1
2024 | Foreign
Foreign tax credits
Foreign tax credit carryforward	59.7
2025 | Foreign
Foreign tax credits
Foreign tax credit carryforward	146.7
2026 | Foreign
Foreign tax credits
Foreign tax credit carryforward	95.1
2028 | Foreign
Foreign tax credits
Foreign tax credit carryforward	171.8
2029 | Foreign
Foreign tax credits
Foreign tax credit carryforward	219.9
2030 | Foreign
Foreign tax credits
Foreign tax credit carryforward	247.6
2031 | Foreign
Foreign tax credits
Foreign tax credit carryforward	582.3
2032 | Foreign
Foreign tax credits
Foreign tax credit carryforward	161.2
2033 | Foreign
Foreign tax credits
Foreign tax credit carryforward	$ 231.5