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SEGMENT AND RELATED INFORMATION: (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
segment
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Financial information related to segments          
Number of reportable segments | segment     3    
Financial information relating to segments          
Net sales $ 2,505.6 $ 2,156.9 $ 7,600.2 $ 7,227.6  
Cost of sales (exclusive of depreciation, amortization and depletion) 1,175.7 1,137.9 3,517.6 3,442.3  
Selling, general and administrative 32.7 30.2 94.1 91.4  
Depreciation, amortization and depletion 212.5 192.0 625.4 597.6  
Exploration 15.5 9.6 39.5 30.6  
Operating income 1,069.2 787.2 3,323.6 3,065.7  
Interest, net (60.7) (76.4) (180.5) (240.5)  
Other income (expense) 8.9 38.7 24.9 54.4  
Income taxes (395.3) (228.5) (1,170.2) (1,137.0)  
Equity earnings of affiliate (0.1) (0.1) (10.3) 0.3  
Non-controlling interest (2.5) (1.9) (7.3) (6.8)  
Net income attributable to SCC 619.5 519.0 1,980.2 1,736.1  
Capital investment 262.7 227.9 753.2 657.6  
Property and mine development, net 9,730.8 9,554.5 9,730.8 9,554.5 $ 9,596.6
Total assets 16,965.0 17,083.2 16,965.0 17,083.2 $ 17,277.4
Corporate, other and eliminations          
Financial information relating to segments          
Net sales (46.2) (19.5) (123.0) (281.5)  
Cost of sales (exclusive of depreciation, amortization and depletion) (40.1) (217.2) (118.5) (419.9)  
Selling, general and administrative 1.8 1.3 6.6 8.4  
Depreciation, amortization and depletion 10.2 10.3 32.7 29.8  
Exploration 3.4 4.0 8.7 10.7  
Operating income (21.5) 182.1 (52.5) 89.5  
Capital investment 5.0 (0.9) 11.8 5.0  
Property and mine development, net 752.9 675.9 752.9 675.9  
Total assets 2,636.5 2,997.3 2,636.5 2,997.3  
Reportable subsegments          
Financial information relating to segments          
Net sales 2,505.6 2,145.4 7,600.2 7,394.2  
Intersegment sales          
Financial information relating to segments          
Net sales   11.5   (166.6)  
Intersegment sales | Corporate, other and eliminations          
Financial information relating to segments          
Net sales (46.2) (19.5) (123.0) (281.5)  
Mexican Open-Pit | Operating segment          
Financial information relating to segments          
Net sales 1,462.2 1,201.5 4,400.3 4,184.7  
Cost of sales (exclusive of depreciation, amortization and depletion) 591.6 702.8 1,781.9 1,915.3  
Selling, general and administrative 18.9 18.6 51.7 49.5  
Depreciation, amortization and depletion 96.9 96.6 288.1 289.2  
Exploration 1.9 0.6 4.6 1.7  
Operating income 752.9 382.9 2,274.0 1,929.0  
Capital investment 141.5 103.2 406.3 288.9  
Property and mine development, net 4,634.3 4,544.7 4,634.3 4,544.7  
Total assets 8,531.7 8,318.9 8,531.7 8,318.9  
Mexican Open-Pit | Reportable subsegments | Operating segment          
Financial information relating to segments          
Net sales 1,462.2 1,201.5 4,400.3 4,184.7  
Mexican IMMSA Unit | Operating segment          
Financial information relating to segments          
Net sales 153.6 159.2 474.3 503.0  
Cost of sales (exclusive of depreciation, amortization and depletion) 133.3 141.1 411.5 386.1  
Selling, general and administrative 2.6 2.7 7.9 7.5  
Depreciation, amortization and depletion 16.8 15.1 51.6 40.8  
Exploration 2.1 1.7 6.0 4.0  
Operating income (1.2) (1.4) (2.7) 64.6  
Capital investment 40.1 37.8 102.6 115.1  
Property and mine development, net 727.4 644.1 727.4 644.1  
Total assets 1,153.6 1,079.8 1,153.6 1,079.8  
Mexican IMMSA Unit | Reportable subsegments | Operating segment          
Financial information relating to segments          
Net sales 107.4 128.2 351.3 388.1  
Mexican IMMSA Unit | Intersegment sales | Operating segment          
Financial information relating to segments          
Net sales 46.2 31.0 123.0 114.9  
Peruvian Operations | Operating segment          
Financial information relating to segments          
Net sales 936.0 815.7 2,848.6 2,821.4  
Cost of sales (exclusive of depreciation, amortization and depletion) 490.9 511.2 1,442.7 1,560.8  
Selling, general and administrative 9.4 7.5 27.9 26.0  
Depreciation, amortization and depletion 88.6 70.1 253.0 237.8  
Exploration 8.1 3.3 20.2 14.1  
Operating income 339.0 223.6 1,104.8 982.7  
Capital investment 76.1 87.8 232.5 248.6  
Property and mine development, net 3,616.2 3,689.8 3,616.2 3,689.8  
Total assets 4,643.2 4,687.2 4,643.2 4,687.2  
Peruvian Operations | Reportable subsegments | Operating segment          
Financial information relating to segments          
Net sales $ 936.0 $ 815.7 $ 2,848.6 $ 2,821.4