SEGMENT AND RELATED INFORMATION: - Provisional Sale (Details) lb in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) lb $ / lb	Dec. 31, 2021 USD ($)
Provisionally priced sales:
Provisional price sales adjustment amounts included in net sales	$ (217.1)	$ 7.8
Copper
Provisionally priced sales:
Provisional price sales adjustment amounts included in accounts receivable	$ (49.9)	(1.2)
Copper | January through June 2023
Provisionally priced sales:
Sales volume (in million lbs.) | lb	276.5
Provisional price | $ / lb	3.81
Molybdenum
Provisionally priced sales:
Provisional price sales adjustment amounts included in accounts receivable	$ (167.2)	$ 9.0
Molybdenum | January through March 2021
Provisionally priced sales:
Sales volume (in million lbs.) | lb	14.3
Provisional price | $ / lb	31.85