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REVENUE: - Revenue by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Revenue Recognition        
Net sales $ 3,118.3 $ 2,300.7 $ 5,718.1 $ 5,094.6
Corporate, other and eliminations        
Revenue Recognition        
Net sales (52.1) (38.6) (93.4) (76.8)
Mexican Open-Pit | Operating segment        
Revenue Recognition        
Net sales 1,738.5 1,311.2 3,204.4 2,938.1
Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 185.2 141.2 331.6 320.7
Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 1,246.7 886.9 2,275.4 1,912.6
Copper        
Revenue Recognition        
Net sales 2,366.6 1,782.5 4,410.3 3,930.3
Copper | Corporate, other and eliminations        
Revenue Recognition        
Net sales (24.0) (17.1) (42.9) (34.3)
Copper | Mexican Open-Pit | Operating segment        
Revenue Recognition        
Net sales 1,347.1 1,042.7 2,553.3 2,383.3
Copper | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 41.8 21.9 69.3 41.4
Copper | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 1,001.7 735.0 1,830.7 1,539.9
Molybdenum        
Revenue Recognition        
Net sales 379.2 254.4 652.8 556.0
Molybdenum | Mexican Open-Pit | Operating segment        
Revenue Recognition        
Net sales 213.3 170.5 357.8 331.2
Molybdenum | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 166.0 83.9 295.0 224.8
Silver        
Revenue Recognition        
Net sales 157.2 98.7 268.7 213.8
Silver | Corporate, other and eliminations        
Revenue Recognition        
Net sales (26.3) (18.9) (48.0) (37.4)
Silver | Mexican Open-Pit | Operating segment        
Revenue Recognition        
Net sales 91.5 54.2 158.1 119.5
Silver | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 52.1 38.2 87.6 81.0
Silver | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 39.9 25.2 71.0 50.7
Zinc        
Revenue Recognition        
Net sales 114.9 63.0 185.0 155.1
Zinc | Corporate, other and eliminations        
Revenue Recognition        
Net sales (0.1) (0.3) 0.6 0.3
Zinc | Mexican Open-Pit | Operating segment        
Revenue Recognition        
Net sales 44.8   49.1  
Zinc | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 70.1 63.3 135.4 154.8
Other        
Revenue Recognition        
Net sales 100.3 102.1 201.2 239.4
Other | Corporate, other and eliminations        
Revenue Recognition        
Net sales (1.8) (2.3) (3.0) (5.4)
Other | Mexican Open-Pit | Operating segment        
Revenue Recognition        
Net sales 41.8 43.8 86.1 104.1
Other | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 21.1 17.8 39.4 43.5
Other | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales $ 39.2 $ 42.8 $ 78.8 $ 97.2