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REVENUE: - Revenue by Geographical Areas (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue Recognition        
Net sales $ 1,785.4 $ 1,818.0 $ 3,505.1 $ 3,571.4
Corporate, other and eliminations        
Revenue Recognition        
Net sales (21.5) (25.4) (48.3) (45.3)
Mexican Open-pit | Operating segment        
Revenue Recognition        
Net sales 1,016.7 954.6 1,970.4 2,026.7
Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 101.6 122.3 236.1 243.4
Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 688.6 766.5 1,346.9 1,346.6
Mexico        
Revenue Recognition        
Net sales 256.2 380.2 692.3 798.4
Mexico | Corporate, other and eliminations        
Revenue Recognition        
Net sales (21.5) (25.4) (48.3) (45.3)
Mexico | Mexican Open-pit | Operating segment        
Revenue Recognition        
Net sales 207.2 312.9 570.9 664.2
Mexico | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 70.5 92.7 169.7 179.5
United States        
Revenue Recognition        
Net sales 322.2 281.1 621.5 568.2
United States | Mexican Open-pit | Operating segment        
Revenue Recognition        
Net sales 298.7 257.9 556.9 536.9
United States | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 4.0 1.6 4.2 3.0
United States | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 19.5 21.6 60.4 28.3
Peru        
Revenue Recognition        
Net sales 42.7 93.0 118.7 180.3
Peru | Mexican Open-pit | Operating segment        
Revenue Recognition        
Net sales       1.6
Peru | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 2.6   5.6  
Peru | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 40.1 93.0 113.1 178.7
Brazil        
Revenue Recognition        
Net sales 22.2 49.7 80.2 105.2
Brazil | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 1.3 5.1 4.8 12.3
Brazil | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 20.9 44.6 75.4 92.9
Chile        
Revenue Recognition        
Net sales 58.6 59.3 108.7 80.3
Chile | Mexican Open-pit | Operating segment        
Revenue Recognition        
Net sales 17.6   19.5 1.1
Chile | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 41.0 59.3 89.2 79.2
Other American countries        
Revenue Recognition        
Net sales 1.5 12.9 10.8 28.0
Other American countries | Mexican Open-pit | Operating segment        
Revenue Recognition        
Net sales 0.7 11.3 9.0 24.1
Other American countries | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 0.6 0.8 1.4 1.2
Other American countries | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 0.2 0.8 0.4 2.7
Switzerland        
Revenue Recognition        
Net sales 399.9 261.1 653.8 608.8
Switzerland | Mexican Open-pit | Operating segment        
Revenue Recognition        
Net sales 236.2 183.0 408.6 408.3
Switzerland | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 15.9 5.1 30.9 17.1
Switzerland | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 147.8 73.0 214.3 183.4
Italy        
Revenue Recognition        
Net sales 53.1 74.3 123.3 156.3
Italy | Mexican Open-pit | Operating segment        
Revenue Recognition        
Net sales   7.8   37.0
Italy | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 1.0 2.8 4.4 8.3
Italy | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 52.1 63.7 118.9 111.0
Spain        
Revenue Recognition        
Net sales 18.2 46.8 64.8 92.3
Spain | Mexican Open-pit | Operating segment        
Revenue Recognition        
Net sales 18.2 46.8 64.8 92.3
Other European Countries        
Revenue Recognition        
Net sales 126.6 98.5 206.0 181.3
Other European Countries | Mexican Open-pit | Operating segment        
Revenue Recognition        
Net sales 56.1 22.4 76.4 45.4
Other European Countries | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 3.6 9.0 9.7 14.9
Other European Countries | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 66.9 67.1 119.9 121.0
Singapore        
Revenue Recognition        
Net sales 229.2 272.1 429.9 384.8
Singapore | Mexican Open-pit | Operating segment        
Revenue Recognition        
Net sales 116.2 72.1 177.9 130.6
Singapore | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 1.9 4.7 5.1 6.4
Singapore | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 111.1 195.3 246.9 247.8
Japan        
Revenue Recognition        
Net sales 140.4 132.7 248.5 260.1
Japan | Mexican Open-pit | Operating segment        
Revenue Recognition        
Net sales 2.3 6.3 11.7 16.1
Japan | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 138.1 126.4 236.8 244.0
Other Asian countries        
Revenue Recognition        
Net sales 114.6 56.3 146.6 127.4
Other Asian countries | Mexican Open-pit | Operating segment        
Revenue Recognition        
Net sales 63.5 34.1 74.7 69.1
Other Asian countries | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 0.2 0.5 0.3 0.7
Other Asian countries | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales $ 50.9 $ 21.7 $ 71.6 $ 57.6