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INCOME TAXES: - Carryforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Foreign tax credits
Other U.S. tax credits	$ 0.0
Unrecognized Tax Benefits		$ 66.1	$ 58.4	$ 214.5
Income Tax Rate (as a percent)	21.00%	21.00%	21.00%
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
Unrecognized Tax Benefits	$ 14.2
Foreign tax credit carryforward	1,465.0
Foreign tax credit carryforward net of unrecognized tax benefit	1,479.2
2024 | Foreign
Foreign tax credits
Foreign tax credit carryforward	73.1
2025 | Foreign
Foreign tax credits
Foreign tax credit carryforward	174.0
2026 | Foreign
Foreign tax credits
Foreign tax credit carryforward	96.2
2028 | Foreign
Foreign tax credits
Foreign tax credit carryforward	175.0
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	$ 479.2

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