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SEGMENT AND RELATED INFORMATION: (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2024
USD ($)
segment
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Financial information related to segments      
Number of reportable segments | segment 3    
Financial information relating to segments      
Net sales $ 2,599.8 $ 2,793.9  
Cost of sales (exclusive of depreciation, amortization and depletion) 1,157.6 1,194.2  
Selling, general and administrative 30.8 30.4  
Depreciation, amortization and depletion 209.0 203.7  
Exploration 12.7 11.9  
Operating income 1,189.7 1,353.7  
Interest, net (53.2) (61.4)  
Other income (expense) 19.0 10.5  
Income taxes (423.4) (480.5)  
Equity earnings of affiliate 6.7 (6.4)  
Non-controlling interest (2.8) (2.7)  
Net income attributable to SCC 736.0 813.2  
Capital investment 213.8 238.1  
Property and mine development, net 9,783.2 9,613.9 $ 9,782.9
Total assets 16,789.3 17,323.3 $ 16,725.3
Corporate, other and eliminations      
Financial information relating to segments      
Net sales (41.3) (38.2)  
Cost of sales (exclusive of depreciation, amortization and depletion) (41.3) (60.9)  
Selling, general and administrative 1.8 2.5  
Depreciation, amortization and depletion 8.7 29.1  
Exploration 1.5 3.8  
Operating income (12.0) (12.7)  
Capital investment 4.4 3.8  
Property and mine development, net 410.8 544.0  
Total assets 1,001.0 2,166.0  
Reportable subsegments      
Financial information relating to segments      
Net sales 2,599.8 2,793.9  
Intersegment sales | Corporate, other and eliminations      
Financial information relating to segments      
Net sales (41.3) (38.2)  
Mexican Open-Pit | Operating segment      
Financial information relating to segments      
Net sales 1,466.0 1,626.9  
Cost of sales (exclusive of depreciation, amortization and depletion) 594.6 618.4  
Selling, general and administrative 17.1 15.9  
Depreciation, amortization and depletion 99.7 75.5  
Exploration 3.6 1.3  
Operating income 751.0 915.8  
Capital investment 107.1 115.7  
Property and mine development, net 4,836.2 4,729.5  
Total assets 9,242.2 9,185.0  
Mexican Open-Pit | Reportable subsegments | Operating segment      
Financial information relating to segments      
Net sales 1,466.0 1,626.9  
Mexican IMMSA Unit | Operating segment      
Financial information relating to segments      
Net sales 146.4 179.5  
Cost of sales (exclusive of depreciation, amortization and depletion) 129.7 155.4  
Selling, general and administrative 2.6 3.0  
Depreciation, amortization and depletion 19.2 17.5  
Exploration 1.8 2.2  
Operating income (6.8) 1.4  
Capital investment 31.8 28.8  
Property and mine development, net 765.0 690.6  
Total assets 1,193.0 1,121.1  
Mexican IMMSA Unit | Reportable subsegments | Operating segment      
Financial information relating to segments      
Net sales 105.1 141.3  
Mexican IMMSA Unit | Intersegment sales | Operating segment      
Financial information relating to segments      
Net sales 41.3 38.2  
Peruvian Operations | Operating segment      
Financial information relating to segments      
Net sales 1,028.7 1,025.7  
Cost of sales (exclusive of depreciation, amortization and depletion) 474.6 481.3  
Selling, general and administrative 9.4 9.0  
Depreciation, amortization and depletion 81.4 81.6  
Exploration 5.8 4.6  
Operating income 457.5 449.2  
Capital investment 70.5 89.8  
Property and mine development, net 3,771.2 3,649.8  
Total assets 5,353.1 4,851.2  
Peruvian Operations | Reportable subsegments | Operating segment      
Financial information relating to segments      
Net sales $ 1,028.7 $ 1,025.7