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SEGMENT AND RELATED INFORMATION: - Geographical (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of revenue by geographical location      
Net sales $ 7,984.9 $ 7,285.6 $ 7,096.7
Mexico      
Schedule of revenue by geographical location      
Net sales 1,526.7 1,531.9 1,649.3
United States      
Schedule of revenue by geographical location      
Net sales 1,363.4 1,195.6 1,258.6
Peru      
Schedule of revenue by geographical location      
Net sales 335.0 340.0 390.4
Brazil      
Schedule of revenue by geographical location      
Net sales 233.0 211.7 271.9
Chile      
Schedule of revenue by geographical location      
Net sales 221.1 191.3 136.3
Other American countries      
Schedule of revenue by geographical location      
Net sales 42.4 43.1 65.8
Switzerland      
Schedule of revenue by geographical location      
Net sales 1,443.3 1,173.4 653.4
Italy      
Schedule of revenue by geographical location      
Net sales 271.6 297.0 347.3
Spain      
Schedule of revenue by geographical location      
Net sales 199.4 186.1 169.4
Other European Countries      
Schedule of revenue by geographical location      
Net sales 521.7 374.6 379.6
Singapore      
Schedule of revenue by geographical location      
Net sales 863.7 966.9 1,069.2
Japan      
Schedule of revenue by geographical location      
Net sales 579.5 500.8 483.4
Other Asian countries      
Schedule of revenue by geographical location      
Net sales 384.1 273.2 222.1
Corporate, other and eliminations      
Schedule of revenue by geographical location      
Net sales (111.0) (83.2) (79.3)
Corporate, other and eliminations | Mexico      
Schedule of revenue by geographical location      
Net sales (111.0) (83.2) (79.3)
Mexican Open-pit      
Schedule of revenue by geographical location      
Net sales 4,412.4 3,963.9 4,075.9
Mexican Open-pit | Mexico      
Schedule of revenue by geographical location      
Net sales 1,296.6 1,262.2 1,343.0
Mexican Open-pit | United States      
Schedule of revenue by geographical location      
Net sales 1,182.8 1,054.9 1,008.0
Mexican Open-pit | Peru      
Schedule of revenue by geographical location      
Net sales   1.6  
Mexican Open-pit | Chile      
Schedule of revenue by geographical location      
Net sales 18.8 1.2  
Mexican Open-pit | Other American countries      
Schedule of revenue by geographical location      
Net sales 36.8 37.6 60.6
Mexican Open-pit | Switzerland      
Schedule of revenue by geographical location      
Net sales 898.2 780.9 453.3
Mexican Open-pit | Italy      
Schedule of revenue by geographical location      
Net sales 0.1 45.1 20.6
Mexican Open-pit | Spain      
Schedule of revenue by geographical location      
Net sales 199.4 186.1 169.4
Mexican Open-pit | Other European Countries      
Schedule of revenue by geographical location      
Net sales 199.9 92.8 234.8
Mexican Open-pit | Singapore      
Schedule of revenue by geographical location      
Net sales 319.9 345.4 528.8
Mexican Open-pit | Japan      
Schedule of revenue by geographical location      
Net sales 46.9 59.9 71.8
Mexican Open-pit | Other Asian countries      
Schedule of revenue by geographical location      
Net sales 213.0 96.2 185.6
Mexican IMMSA Unit      
Schedule of revenue by geographical location      
Net sales 529.9 464.8 527.9
Mexican IMMSA Unit | Mexico      
Schedule of revenue by geographical location      
Net sales 341.1 352.9 385.6
Mexican IMMSA Unit | United States      
Schedule of revenue by geographical location      
Net sales 27.2 6.2 6.6
Mexican IMMSA Unit | Peru      
Schedule of revenue by geographical location      
Net sales 13.0    
Mexican IMMSA Unit | Brazil      
Schedule of revenue by geographical location      
Net sales 18.7 17.3 43.8
Mexican IMMSA Unit | Other American countries      
Schedule of revenue by geographical location      
Net sales 2.9 2.2 3.8
Mexican IMMSA Unit | Switzerland      
Schedule of revenue by geographical location      
Net sales 69.9 36.7 43.4
Mexican IMMSA Unit | Italy      
Schedule of revenue by geographical location      
Net sales 9.5 13.3 21.7
Mexican IMMSA Unit | Other European Countries      
Schedule of revenue by geographical location      
Net sales 40.2 24.9 19.9
Mexican IMMSA Unit | Singapore      
Schedule of revenue by geographical location      
Net sales 6.9 10.4 2.2
Mexican IMMSA Unit | Other Asian countries      
Schedule of revenue by geographical location      
Net sales 0.5 0.9 0.9
Peruvian Operations      
Schedule of revenue by geographical location      
Net sales 3,153.6 2,940.1 2,572.2
Peruvian Operations | United States      
Schedule of revenue by geographical location      
Net sales 153.4 134.5 244.0
Peruvian Operations | Peru      
Schedule of revenue by geographical location      
Net sales 322.0 338.4 390.4
Peruvian Operations | Brazil      
Schedule of revenue by geographical location      
Net sales 214.3 194.4 228.1
Peruvian Operations | Chile      
Schedule of revenue by geographical location      
Net sales 202.3 190.1 136.3
Peruvian Operations | Other American countries      
Schedule of revenue by geographical location      
Net sales 2.7 3.3 1.4
Peruvian Operations | Switzerland      
Schedule of revenue by geographical location      
Net sales 475.2 355.8 156.7
Peruvian Operations | Italy      
Schedule of revenue by geographical location      
Net sales 262.0 238.6 305.0
Peruvian Operations | Other European Countries      
Schedule of revenue by geographical location      
Net sales 281.6 256.9 124.9
Peruvian Operations | Singapore      
Schedule of revenue by geographical location      
Net sales 536.9 611.1 538.2
Peruvian Operations | Japan      
Schedule of revenue by geographical location      
Net sales 532.6 440.9 411.6
Peruvian Operations | Other Asian countries      
Schedule of revenue by geographical location      
Net sales $ 170.6 $ 176.1 $ 35.6