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SEGMENT AND RELATED INFORMATION: (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
segment
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Financial information related to segments          
Number of reportable segments | segment     3    
Financial information relating to segments          
Net sales $ 3,118.3 $ 2,300.7 $ 5,718.1 $ 5,094.6  
Cost of sales (exclusive of depreciation, amortization and depletion) 1,248.9 1,147.7 2,406.5 2,341.9  
Selling, general and administrative 33.9 31.0 64.8 61.4  
Depreciation, amortization and depletion 209.6 209.2 418.6 412.9  
Exploration 18.6 12.1 31.2 24.0  
Operating income 1,607.3 900.7 2,797.0 2,254.4  
Interest, net (56.8) (58.4) (109.9) (119.8)  
Other income (expense) (19.9) 5.6 (0.9) 16.1  
Income taxes (578.8) (294.5) (1,002.1) (774.9)  
Equity earnings of affiliate 2.0 (3.8) 8.6 (10.2)  
Non-controlling interest (3.6) (2.1) (6.4) (4.9)  
Net income attributable to SCC 950.2 547.5 1,686.2 1,360.7  
Capital investment 331.8 252.5 545.6 490.6  
Property and mine development, net 9,871.5 9,688.1 9,871.5 9,688.1 $ 9,782.9
Total assets 17,777.7 16,939.5 17,777.7 16,939.5 $ 16,725.3
Corporate, other and eliminations          
Financial information relating to segments          
Net sales (52.1) (38.6) (93.4) (76.8)  
Cost of sales (exclusive of depreciation, amortization and depletion) (50.1) (17.5) (91.5) (78.4)  
Selling, general and administrative 2.8 2.3 4.6 4.8  
Depreciation, amortization and depletion 9.0 (6.6) 17.7 22.5  
Exploration 2.9 1.5 4.4 5.3  
Operating income (16.7) (18.3) (28.7) (31.0)  
Capital investment 1.8 3.1 6.2 6.9  
Property and mine development, net 642.6 640.9 642.6 640.9  
Total assets 1,663.0 2,183.6 1,663.0 2,183.6  
Reportable subsegments          
Financial information relating to segments          
Net sales 3,118.3 2,300.7 5,718.1 5,094.6  
Intersegment sales          
Financial information relating to segments          
Net sales 0.0   0.0    
Intersegment sales | Corporate, other and eliminations          
Financial information relating to segments          
Net sales (52.1) (38.6) (93.4) (76.8)  
Mexican Open-Pit | Operating segment          
Financial information relating to segments          
Net sales 1,738.5 1,311.2 3,204.4 2,938.1  
Cost of sales (exclusive of depreciation, amortization and depletion) 663.0 572.0 1,257.6 1,190.4  
Selling, general and administrative 18.1 16.9 35.2 32.8  
Depreciation, amortization and depletion 102.6 115.7 202.3 191.2  
Exploration 2.4 1.4 6.0 2.7  
Operating income 952.4 605.2 1,703.3 1,521.0  
Capital investment 234.7 149.1 341.7 264.8  
Property and mine development, net 4,687.2 4,705.8 4,687.2 4,705.8  
Total assets 9,164.4 8,976.3 9,164.4 8,976.3  
Mexican Open-Pit | Reportable subsegments | Operating segment          
Financial information relating to segments          
Net sales 1,738.5 1,311.2 3,204.4 2,938.1  
Mexican IMMSA Unit | Operating segment          
Financial information relating to segments          
Net sales 185.2 141.2 331.6 320.7  
Cost of sales (exclusive of depreciation, amortization and depletion) 109.9 122.8 239.6 278.2  
Selling, general and administrative 3.3 2.3 5.9 5.3  
Depreciation, amortization and depletion 18.2 17.3 37.4 34.8  
Exploration 2.6 1.7 4.4 3.9  
Operating income 51.1 (2.9) 44.4 (1.5)  
Capital investment 29.4 33.7 61.2 62.5  
Property and mine development, net 775.0 704.9 775.0 704.9  
Total assets 1,214.7 1,130.7 1,214.7 1,130.7  
Mexican IMMSA Unit | Reportable subsegments | Operating segment          
Financial information relating to segments          
Net sales 133.1 102.6 238.2 243.9  
Mexican IMMSA Unit | Intersegment sales | Operating segment          
Financial information relating to segments          
Net sales 52.1 38.6 93.4 76.8  
Peruvian Operations | Operating segment          
Financial information relating to segments          
Net sales 1,246.7 886.9 2,275.4 1,912.6  
Cost of sales (exclusive of depreciation, amortization and depletion) 526.1 470.4 1,000.7 951.7  
Selling, general and administrative 9.7 9.5 19.1 18.5  
Depreciation, amortization and depletion 79.8 82.8 161.2 164.4  
Exploration 10.7 7.5 16.5 12.1  
Operating income 620.4 316.7 1,077.9 765.9  
Capital investment 65.9 66.6 136.4 156.4  
Property and mine development, net 3,766.7 3,636.5 3,766.7 3,636.5  
Total assets 5,735.6 4,648.9 5,735.6 4,648.9  
Peruvian Operations | Reportable subsegments | Operating segment          
Financial information relating to segments          
Net sales $ 1,246.7 $ 886.9 $ 2,275.4 $ 1,912.6