SEGMENT AND RELATED INFORMATION: - Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Financial information related to segments
Trade receivables	$ 1,141.1	$ 1,394.1
Related parties receivable current:	27.3	33.3
Affiliates
Financial information related to segments
Related parties receivable current:	27.3	33.3
Corporate, other and eliminations | Intersegment sales
Financial information related to segments
Related parties receivable current:	(0.1)	2.0
Mexican Open-Pit
Financial information related to segments
Trade receivables	556.3	788.1
Related parties receivable current:	25.7	31.1
Mexican IMMSA Unit
Financial information related to segments
Trade receivables	49.1	60.0
Related parties receivable current:	0.9	0.1
Peruvian Operations
Financial information related to segments
Trade receivables	535.7	546.0
Related parties receivable current:	$ 0.8	$ 0.1