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SEGMENT AND RELATED INFORMATION: (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2023
USD ($)
segment
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Financial information related to segments      
Number of reportable segments | segment 3    
Financial information relating to segments      
Net sales $ 2,793.9 $ 2,763.8  
Cost of sales (exclusive of depreciation, amortization and depletion) 1,194.2 1,057.7  
Selling, general and administrative 30.4 30.3  
Depreciation, amortization and depletion 203.7 196.6  
Exploration 11.9 9.1  
Operating income 1,353.7 1,470.1  
Interest, net (61.4) (83.1)  
Other income (expense) 10.5 11.7  
Income taxes (480.5) (612.1)  
Equity earnings of affiliate (6.4) 1.2  
Non-controlling interest (2.7) (3.1)  
Net income attributable to SCC 813.2 784.7  
Capital investment 238.1 205.2  
Property and mine development, net 9,613.9 9,492.9 $ 9,596.6
Total assets 17,323.3 17,898.9 $ 17,277.4
Corporate, other and eliminations      
Financial information relating to segments      
Net sales (38.2) (154.7)  
Cost of sales (exclusive of depreciation, amortization and depletion) (60.9) (91.4)  
Selling, general and administrative 2.5 3.9  
Depreciation, amortization and depletion 29.1 9.7  
Exploration 3.8 0.7  
Operating income (12.7) (77.5)  
Capital investment 3.8 3.0  
Property and mine development, net 544.0 551.1  
Total assets 2,166.0 3,414.2  
Reportable subsegments      
Financial information relating to segments      
Net sales 2,793.9 2,763.8  
Reportable subsegments | Corporate, other and eliminations      
Financial information relating to segments      
Net sales   (114.6)  
Intersegment sales | Corporate, other and eliminations      
Financial information relating to segments      
Net sales (38.2) (40.0)  
Mexican Open-Pit | Operating segment      
Financial information relating to segments      
Net sales 1,626.9 1,646.2  
Cost of sales (exclusive of depreciation, amortization and depletion) 618.4 548.3  
Selling, general and administrative 15.9 15.5  
Depreciation, amortization and depletion 75.5 98.0  
Exploration 1.3 0.5  
Operating income 915.8 983.8  
Capital investment 115.7 89.3  
Property and mine development, net 4,729.5 4,662.5  
Total assets 9,185.0 8,611.5  
Mexican Open-Pit | Reportable subsegments | Operating segment      
Financial information relating to segments      
Net sales 1,626.9 1,646.2  
Mexican IMMSA Unit | Operating segment      
Financial information relating to segments      
Net sales 179.5 177.5  
Cost of sales (exclusive of depreciation, amortization and depletion) 155.4 131.7  
Selling, general and administrative 3.0 2.4  
Depreciation, amortization and depletion 17.5 11.3  
Exploration 2.2 1.1  
Operating income 1.4 31.0  
Capital investment 28.8 31.7  
Property and mine development, net 690.6 593.5  
Total assets 1,121.1 1,080.9  
Mexican IMMSA Unit | Reportable subsegments | Operating segment      
Financial information relating to segments      
Net sales 141.3 137.5  
Mexican IMMSA Unit | Intersegment sales | Operating segment      
Financial information relating to segments      
Net sales 38.2 40.0  
Peruvian Operations | Operating segment      
Financial information relating to segments      
Net sales 1,025.7 1,094.8  
Cost of sales (exclusive of depreciation, amortization and depletion) 481.3 469.1  
Selling, general and administrative 9.0 8.5  
Depreciation, amortization and depletion 81.6 77.6  
Exploration 4.6 6.8  
Operating income 449.2 532.8  
Capital investment 89.8 81.2  
Property and mine development, net 3,649.8 3,685.8  
Total assets 4,851.2 4,792.3  
Peruvian Operations | Reportable subsegments | Operating segment      
Financial information relating to segments      
Net sales $ 1,025.7 $ 1,094.8