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SEGMENT AND RELATED INFORMATION: - Geographical (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of revenue by geographical location      
Net sales $ 11,433.4 $ 9,895.8 $ 10,047.9
Mexico      
Schedule of revenue by geographical location      
Net sales 2,854.9 2,671.1 2,288.7
United States      
Schedule of revenue by geographical location      
Net sales 1,471.4 1,620.3 1,910.4
Peru      
Schedule of revenue by geographical location      
Net sales 661.4 394.9 615.0
Brazil      
Schedule of revenue by geographical location      
Net sales 513.5 390.3 452.0
Chile      
Schedule of revenue by geographical location      
Net sales 452.3 399.5 444.5
Other American countries      
Schedule of revenue by geographical location      
Net sales 70.2 60.5 65.7
Switzerland      
Schedule of revenue by geographical location      
Net sales 1,440.7 1,085.4 1,477.8
Italy      
Schedule of revenue by geographical location      
Net sales 369.0 414.4 261.4
Spain      
Schedule of revenue by geographical location      
Net sales 549.1 472.9 458.2
Other European Countries      
Schedule of revenue by geographical location      
Net sales 726.3 407.7 362.8
China      
Schedule of revenue by geographical location      
Net sales 1,183.1 749.2 572.5
Singapore      
Schedule of revenue by geographical location      
Net sales 255.7 364.3 288.4
Japan      
Schedule of revenue by geographical location      
Net sales 726.2 668.3 616.2
Other Asian countries      
Schedule of revenue by geographical location      
Net sales 159.7 197.0 234.3
Operating segment      
Schedule of revenue by geographical location      
Net sales 11,625.8 10,047.4 10,347.6
Operating segment | Mexico      
Schedule of revenue by geographical location      
Net sales 3,018.4 2,804.6 2,426.7
Operating segment | United States      
Schedule of revenue by geographical location      
Net sales 1,471.4 1,620.3 1,910.4
Operating segment | Peru      
Schedule of revenue by geographical location      
Net sales 690.2 413.0 776.7
Operating segment | Brazil      
Schedule of revenue by geographical location      
Net sales 513.5 390.3 452.0
Operating segment | Chile      
Schedule of revenue by geographical location      
Net sales 452.3 399.5 444.5
Operating segment | Other American countries      
Schedule of revenue by geographical location      
Net sales 70.2 60.5 65.7
Operating segment | Switzerland      
Schedule of revenue by geographical location      
Net sales 1,440.7 1,085.4 1,477.8
Operating segment | Italy      
Schedule of revenue by geographical location      
Net sales 369.0 414.4 261.4
Operating segment | Spain      
Schedule of revenue by geographical location      
Net sales 549.1 472.9 458.2
Operating segment | Other European Countries      
Schedule of revenue by geographical location      
Net sales 726.3 407.7 362.8
Operating segment | China      
Schedule of revenue by geographical location      
Net sales 1,183.1 749.2 572.5
Operating segment | Singapore      
Schedule of revenue by geographical location      
Net sales 255.7 364.3 288.4
Operating segment | Japan      
Schedule of revenue by geographical location      
Net sales 726.2 668.3 616.2
Operating segment | Other Asian countries      
Schedule of revenue by geographical location      
Net sales 159.7 197.0 234.3
Corporate & Eliminations      
Schedule of revenue by geographical location      
Net sales (192.4) (151.6) (299.7)
Corporate & Eliminations | Mexico      
Schedule of revenue by geographical location      
Net sales (163.5) (133.5) (138.0)
Corporate & Eliminations | Peru      
Schedule of revenue by geographical location      
Net sales (28.9) (18.1) (161.7)
Mexican Open-Pit | Operating segment      
Schedule of revenue by geographical location      
Net sales 6,317.0 5,562.3 5,772.6
Mexican Open-Pit | Operating segment | Mexico      
Schedule of revenue by geographical location      
Net sales 2,481.5 2,329.3 1,962.0
Mexican Open-Pit | Operating segment | United States      
Schedule of revenue by geographical location      
Net sales 1,129.9 1,086.6 1,486.2
Mexican Open-Pit | Operating segment | Peru      
Schedule of revenue by geographical location      
Net sales     162.2
Mexican Open-Pit | Operating segment | Chile      
Schedule of revenue by geographical location      
Net sales   (8.4) 19.9
Mexican Open-Pit | Operating segment | Other American countries      
Schedule of revenue by geographical location      
Net sales 43.1 39.3 35.4
Mexican Open-Pit | Operating segment | Switzerland      
Schedule of revenue by geographical location      
Net sales 735.2 520.2 693.7
Mexican Open-Pit | Operating segment | Italy      
Schedule of revenue by geographical location      
Net sales   1.1 2.1
Mexican Open-Pit | Operating segment | Spain      
Schedule of revenue by geographical location      
Net sales 461.0 397.0 420.7
Mexican Open-Pit | Operating segment | Other European Countries      
Schedule of revenue by geographical location      
Net sales 163.9 163.5 124.3
Mexican Open-Pit | Operating segment | China      
Schedule of revenue by geographical location      
Net sales 921.8 631.7 517.6
Mexican Open-Pit | Operating segment | Singapore      
Schedule of revenue by geographical location      
Net sales 104.4 155.5 103.9
Mexican Open-Pit | Operating segment | Japan      
Schedule of revenue by geographical location      
Net sales 185.1 160.3 88.0
Mexican Open-Pit | Operating segment | Other Asian countries      
Schedule of revenue by geographical location      
Net sales 91.1 86.2 156.6
Mexican IMMSA Unit | Operating segment      
Schedule of revenue by geographical location      
Net sales 704.1 630.8 666.5
Mexican IMMSA Unit | Operating segment | Mexico      
Schedule of revenue by geographical location      
Net sales 503.0 475.3 464.7
Mexican IMMSA Unit | Operating segment | United States      
Schedule of revenue by geographical location      
Net sales 2.4 18.3 54.0
Mexican IMMSA Unit | Operating segment | Peru      
Schedule of revenue by geographical location      
Net sales 28.6 18.4  
Mexican IMMSA Unit | Operating segment | Brazil      
Schedule of revenue by geographical location      
Net sales 39.4 34.5 41.3
Mexican IMMSA Unit | Operating segment | Other American countries      
Schedule of revenue by geographical location      
Net sales   0.5 2.6
Mexican IMMSA Unit | Operating segment | Switzerland      
Schedule of revenue by geographical location      
Net sales 92.5 29.8 44.6
Mexican IMMSA Unit | Operating segment | Italy      
Schedule of revenue by geographical location      
Net sales 24.9 18.9 19.3
Mexican IMMSA Unit | Operating segment | Other European Countries      
Schedule of revenue by geographical location      
Net sales 10.4 24.4 31.1
Mexican IMMSA Unit | Operating segment | China      
Schedule of revenue by geographical location      
Net sales 3.5 2.0  
Mexican IMMSA Unit | Operating segment | Singapore      
Schedule of revenue by geographical location      
Net sales (0.6) 8.1 8.4
Mexican IMMSA Unit | Operating segment | Other Asian countries      
Schedule of revenue by geographical location      
Net sales   0.3 0.5
Peruvian Operations | Operating segment      
Schedule of revenue by geographical location      
Net sales 4,604.6 3,854.3 3,908.5
Peruvian Operations | Operating segment | Mexico      
Schedule of revenue by geographical location      
Net sales 33.9    
Peruvian Operations | Operating segment | United States      
Schedule of revenue by geographical location      
Net sales 339.1 515.4 370.2
Peruvian Operations | Operating segment | Peru      
Schedule of revenue by geographical location      
Net sales 661.6 394.6 614.5
Peruvian Operations | Operating segment | Brazil      
Schedule of revenue by geographical location      
Net sales 474.1 355.8 410.7
Peruvian Operations | Operating segment | Chile      
Schedule of revenue by geographical location      
Net sales 452.3 407.9 424.6
Peruvian Operations | Operating segment | Other American countries      
Schedule of revenue by geographical location      
Net sales 27.1 20.7 27.7
Peruvian Operations | Operating segment | Switzerland      
Schedule of revenue by geographical location      
Net sales 613.0 535.4 739.5
Peruvian Operations | Operating segment | Italy      
Schedule of revenue by geographical location      
Net sales 344.2 394.4 240.0
Peruvian Operations | Operating segment | Spain      
Schedule of revenue by geographical location      
Net sales 88.1 75.9 37.5
Peruvian Operations | Operating segment | Other European Countries      
Schedule of revenue by geographical location      
Net sales 552.0 219.8 207.4
Peruvian Operations | Operating segment | China      
Schedule of revenue by geographical location      
Net sales 257.8 115.2 54.9
Peruvian Operations | Operating segment | Singapore      
Schedule of revenue by geographical location      
Net sales 151.9 200.7 176.1
Peruvian Operations | Operating segment | Japan      
Schedule of revenue by geographical location      
Net sales 541.1 508.0 528.2
Peruvian Operations | Operating segment | Other Asian countries      
Schedule of revenue by geographical location      
Net sales $ 68.6 $ 110.5 $ 77.2