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REVENUE: - Revenue by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue Recognition        
Net sales $ 2,505.6 $ 2,156.9 $ 7,600.2 $ 7,227.6
Corporate, other and eliminations        
Revenue Recognition        
Net sales (46.2) (19.5) (123.0) (281.5)
Mexican Open-Pit | Operating segment        
Revenue Recognition        
Net sales 1,462.2 1,201.5 4,400.3 4,184.7
Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 153.6 159.2 474.3 503.0
Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 936.0 815.7 2,848.6 2,821.4
Copper        
Revenue Recognition        
Net sales 1,874.6 1,610.0 5,804.9 5,562.7
Copper | Corporate, other and eliminations        
Revenue Recognition        
Net sales (22.2) (3.1) (56.5) (215.0)
Copper | Mexican Open-Pit | Operating segment        
Revenue Recognition        
Net sales 1,118.1 950.4 3,501.4 3,432.8
Copper | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 23.7 11.9 65.1 62.3
Copper | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 755.0 650.8 2,294.9 2,282.6
Molybdenum        
Revenue Recognition        
Net sales 343.1 212.6 899.1 686.6
Molybdenum | Mexican Open-Pit | Operating segment        
Revenue Recognition        
Net sales 230.3 131.9 561.5 388.1
Molybdenum | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 112.8 80.7 337.6 298.5
Silver        
Revenue Recognition        
Net sales 104.0 87.6 317.8 292.2
Silver | Corporate, other and eliminations        
Revenue Recognition        
Net sales (22.0) (14.2) (59.4) (56.6)
Silver | Mexican Open-Pit | Operating segment        
Revenue Recognition        
Net sales 62.4 53.8 181.9 178.6
Silver | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 40.1 28.0 121.1 101.8
Silver | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales 23.5 20.0 74.2 68.4
Zinc        
Revenue Recognition        
Net sales 70.0 101.0 225.1 280.6
Zinc | Corporate, other and eliminations        
Revenue Recognition        
Net sales 0.2 0.1 0.5 (0.9)
Zinc | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 69.8 100.9 224.6 281.5
Other        
Revenue Recognition        
Net sales 113.9 145.7 353.3 405.5
Other | Corporate, other and eliminations        
Revenue Recognition        
Net sales (2.2) (2.3) (7.6) (9.0)
Other | Mexican Open-Pit | Operating segment        
Revenue Recognition        
Net sales 51.4 65.4 155.5 185.2
Other | Mexican IMMSA Unit | Operating segment        
Revenue Recognition        
Net sales 20.0 18.4 63.5 57.4
Other | Peruvian Operations | Operating segment        
Revenue Recognition        
Net sales $ 44.7 $ 64.2 $ 141.9 $ 171.9