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SEGMENT AND RELATED INFORMATION: - Sales (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
SALES VALUE PER SEGMENT:      
Net sales $ 9,895.8 $ 10,047.9 $ 10,934.1
Copper      
SALES VALUE PER SEGMENT:      
Net sales 7,591.1 7,538.8 8,828.3
Molybdenum      
SALES VALUE PER SEGMENT:      
Net sales 1,129.7 1,192.7 1,053.1
Zinc      
SALES VALUE PER SEGMENT:      
Net sales 301.4 374.2 289.5
Silver      
SALES VALUE PER SEGMENT:      
Net sales 417.6 402.6 474.4
Other      
SALES VALUE PER SEGMENT:      
Net sales 456.0 539.7 288.8
Corporate, other and eliminations      
SALES VALUE PER SEGMENT:      
Net sales (151.6) (299.7) (145.9)
Corporate, other and eliminations | Copper      
SALES VALUE PER SEGMENT:      
Net sales (69.3) (220.0) (74.1)
Corporate, other and eliminations | Zinc      
SALES VALUE PER SEGMENT:      
Net sales 0.5 0.4 0.5
Corporate, other and eliminations | Silver      
SALES VALUE PER SEGMENT:      
Net sales (74.6) (68.4) (64.1)
Corporate, other and eliminations | Other      
SALES VALUE PER SEGMENT:      
Net sales (8.2) (11.7) (8.2)
Mexican Open-Pit | Operating segment      
SALES VALUE PER SEGMENT:      
Net sales 5,562.3 5,772.6 6,109.0
Mexican Open-Pit | Operating segment | Copper      
SALES VALUE PER SEGMENT:      
Net sales 4,442.2 4,579.2 5,182.1
Mexican Open-Pit | Operating segment | Molybdenum      
SALES VALUE PER SEGMENT:      
Net sales 689.4 705.3 538.4
Mexican Open-Pit | Operating segment | Silver      
SALES VALUE PER SEGMENT:      
Net sales 233.7 241.9 252.8
Mexican Open-Pit | Operating segment | Other      
SALES VALUE PER SEGMENT:      
Net sales 197.0 246.3 135.7
Mexican IMMSA Unit | Operating segment      
SALES VALUE PER SEGMENT:      
Net sales 630.8 666.5 600.2
Mexican IMMSA Unit | Operating segment | Copper      
SALES VALUE PER SEGMENT:      
Net sales 89.1 83.6 94.9
Mexican IMMSA Unit | Operating segment | Zinc      
SALES VALUE PER SEGMENT:      
Net sales 300.9 373.8 289.0
Mexican IMMSA Unit | Operating segment | Silver      
SALES VALUE PER SEGMENT:      
Net sales 158.3 133.8 152.7
Mexican IMMSA Unit | Operating segment | Other      
SALES VALUE PER SEGMENT:      
Net sales 82.5 75.3 63.6
Peruvian Operations | Operating segment      
SALES VALUE PER SEGMENT:      
Net sales 3,854.3 3,908.5 4,370.8
Peruvian Operations | Operating segment | Copper      
SALES VALUE PER SEGMENT:      
Net sales 3,129.1 3,096.0 3,625.4
Peruvian Operations | Operating segment | Molybdenum      
SALES VALUE PER SEGMENT:      
Net sales 440.3 487.4 514.7
Peruvian Operations | Operating segment | Silver      
SALES VALUE PER SEGMENT:      
Net sales 100.2 95.3 133.0
Peruvian Operations | Operating segment | Other      
SALES VALUE PER SEGMENT:      
Net sales $ 184.7 $ 229.8 $ 97.7