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SEGMENT AND RELATED INFORMATION: - Geographical (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of revenue by geographical location      
Net sales $ 9,895.8 $ 10,047.9 $ 10,934.1
Mexico      
Schedule of revenue by geographical location      
Net sales 2,671.1 2,288.7 2,140.0
United States      
Schedule of revenue by geographical location      
Net sales 1,620.3 1,910.4 1,933.5
Peru      
Schedule of revenue by geographical location      
Net sales 394.9 615.0 586.3
Brazil      
Schedule of revenue by geographical location      
Net sales 390.3 452.0 437.1
Chile      
Schedule of revenue by geographical location      
Net sales 399.5 444.5 384.5
Other American countries      
Schedule of revenue by geographical location      
Net sales 60.5 65.7 42.7
Switzerland      
Schedule of revenue by geographical location      
Net sales 1,085.4 1,477.8 1,697.0
Italy      
Schedule of revenue by geographical location      
Net sales 414.4 261.4 307.8
Spain      
Schedule of revenue by geographical location      
Net sales 472.9 458.2 502.0
Other European Countries      
Schedule of revenue by geographical location      
Net sales 407.7 362.8 732.2
China      
Schedule of revenue by geographical location      
Net sales 749.2 572.5 214.7
Singapore      
Schedule of revenue by geographical location      
Net sales 364.3 288.4 957.8
Japan      
Schedule of revenue by geographical location      
Net sales 668.3 616.2 629.1
Other Asian countries      
Schedule of revenue by geographical location      
Net sales 197.0 234.3 369.4
Corporate & Eliminations      
Schedule of revenue by geographical location      
Net sales (151.6) (299.7) (145.9)
Corporate & Eliminations | Mexico      
Schedule of revenue by geographical location      
Net sales (133.5) (138.0) (145.9)
Corporate & Eliminations | Peru      
Schedule of revenue by geographical location      
Net sales (18.1) (161.7)  
Mexican Open-Pit | Operating segment      
Schedule of revenue by geographical location      
Net sales 5,562.3 5,772.6 6,109.0
Mexican Open-Pit | Operating segment | Mexico      
Schedule of revenue by geographical location      
Net sales 2,329.3 1,962.0 1,893.3
Mexican Open-Pit | Operating segment | United States      
Schedule of revenue by geographical location      
Net sales 1,086.6 1,486.2 1,648.1
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 3.3
Mexican Open-Pit | Operating segment | Other American countries      
Schedule of revenue by geographical location      
Net sales 39.3 35.4 31.3
Mexican Open-Pit | Operating segment | Switzerland      
Schedule of revenue by geographical location      
Net sales 520.2 693.7 1,097.2
Mexican Open-Pit | Operating segment | Italy      
Schedule of revenue by geographical location      
Net sales 1.1 2.1 0.7
Mexican Open-Pit | Operating segment | Spain      
Schedule of revenue by geographical location      
Net sales 397.0 420.7 410.2
Mexican Open-Pit | Operating segment | Other European Countries      
Schedule of revenue by geographical location      
Net sales 163.5 124.3 275.8
Mexican Open-Pit | Operating segment | China      
Schedule of revenue by geographical location      
Net sales 631.7 517.6 189.7
Mexican Open-Pit | Operating segment | Singapore      
Schedule of revenue by geographical location      
Net sales 155.5 103.9 441.9
Mexican Open-Pit | Operating segment | Japan      
Schedule of revenue by geographical location      
Net sales 160.3 88.0 23.6
Mexican Open-Pit | Operating segment | Other Asian countries      
Schedule of revenue by geographical location      
Net sales 86.2 156.6 93.9
Mexican IMMSA Unit | Operating segment      
Schedule of revenue by geographical location      
Net sales 630.8 666.5 600.2
Mexican IMMSA Unit | Operating segment | Mexico      
Schedule of revenue by geographical location      
Net sales 475.3 464.7 387.6
Mexican IMMSA Unit | Operating segment | United States      
Schedule of revenue by geographical location      
Net sales 18.3 54.0 52.3
Mexican IMMSA Unit | Operating segment | Peru      
Schedule of revenue by geographical location      
Net sales 18.4   (0.3)
Mexican IMMSA Unit | Operating segment | Brazil      
Schedule of revenue by geographical location      
Net sales 34.5 41.3 30.7
Mexican IMMSA Unit | Operating segment | Other American countries      
Schedule of revenue by geographical location      
Net sales 0.5 2.6 0.7
Mexican IMMSA Unit | Operating segment | Switzerland      
Schedule of revenue by geographical location      
Net sales 29.8 44.6 55.1
Mexican IMMSA Unit | Operating segment | Italy      
Schedule of revenue by geographical location      
Net sales 18.9 19.3 8.8
Mexican IMMSA Unit | Operating segment | Other European Countries      
Schedule of revenue by geographical location      
Net sales 24.4 31.1 45.5
Mexican IMMSA Unit | Operating segment | China      
Schedule of revenue by geographical location      
Net sales 2.0    
Mexican IMMSA Unit | Operating segment | Singapore      
Schedule of revenue by geographical location      
Net sales 8.1 8.4 19.4
Mexican IMMSA Unit | Operating segment | Other Asian countries      
Schedule of revenue by geographical location      
Net sales 0.3 0.5 0.4
Peruvian Operations | Operating segment      
Schedule of revenue by geographical location      
Net sales 3,854.3 3,908.5 4,370.8
Peruvian Operations | Operating segment | Mexico      
Schedule of revenue by geographical location      
Net sales     5.0
Peruvian Operations | Operating segment | United States      
Schedule of revenue by geographical location      
Net sales 515.4 370.2 233.1
Peruvian Operations | Operating segment | Peru      
Schedule of revenue by geographical location      
Net sales 394.6 614.5 586.6
Peruvian Operations | Operating segment | Brazil      
Schedule of revenue by geographical location      
Net sales 355.8 410.7 406.4
Peruvian Operations | Operating segment | Chile      
Schedule of revenue by geographical location      
Net sales 407.9 424.6 381.2
Peruvian Operations | Operating segment | Other American countries      
Schedule of revenue by geographical location      
Net sales 20.7 27.7 10.7
Peruvian Operations | Operating segment | Switzerland      
Schedule of revenue by geographical location      
Net sales 535.4 739.5 544.7
Peruvian Operations | Operating segment | Italy      
Schedule of revenue by geographical location      
Net sales 394.4 240.0 298.3
Peruvian Operations | Operating segment | Spain      
Schedule of revenue by geographical location      
Net sales 75.9 37.5 91.8
Peruvian Operations | Operating segment | Other European Countries      
Schedule of revenue by geographical location      
Net sales 219.8 207.4 410.9
Peruvian Operations | Operating segment | China      
Schedule of revenue by geographical location      
Net sales 115.2 54.9 25.0
Peruvian Operations | Operating segment | Singapore      
Schedule of revenue by geographical location      
Net sales 200.7 176.1 496.5
Peruvian Operations | Operating segment | Japan      
Schedule of revenue by geographical location      
Net sales 508.0 528.2 605.5
Peruvian Operations | Operating segment | Other Asian countries      
Schedule of revenue by geographical location      
Net sales $ 110.5 $ 77.2 $ 275.1