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SEGMENT AND RELATED INFORMATION: (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
segment
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Financial information related to segments          
Number of reportable segments | segment     3    
Financial information relating to segments          
Net sales $ 3,377.3 $ 2,930.9 $ 9,550.2 $ 8,649.0  
Cost of sales (exclusive of depreciation, amortization and depletion) 1,356.8 1,223.1 3,887.7 3,629.6  
Selling, general and administrative 33.7 31.2 97.9 96.0  
Depreciation, amortization and depletion 207.8 213.1 637.7 631.7  
Exploration 10.2 13.2 35.6 44.4  
Operating income 1,768.8 1,450.3 4,891.3 4,247.3  
Interest, net (43.5) (44.8) (127.6) (154.7)  
Other income (expense) (1.1) 21.2 (17.2) 20.3  
Income before income taxes 1,724.1 1,426.7 4,746.6 4,112.9  
Capital investment 349.2 246.4 902.7 792.0  
Property and mine development, net 10,002.1 9,927.1 10,002.1 9,927.1 $ 9,883.3
Total assets 20,331.8 18,415.5 20,331.8 18,415.5 $ 18,713.5
Operating segment          
Financial information relating to segments          
Net sales 3,446.3 2,977.6 9,729.4 8,789.1  
Cost of sales (exclusive of depreciation, amortization and depletion) 1,429.0 1,279.8 4,091.8 3,777.8  
Selling, general and administrative 32.1 29.4 90.6 89.6  
Depreciation, amortization and depletion 196.0 204.6 601.5 605.5  
Exploration 9.4 11.2 30.4 38.0  
Operating income 1,779.8 1,452.5 4,915.1 4,278.1  
Capital investment 344.7 242.6 895.3 782.0  
Property and mine development, net 9,487.2 9,414.0 9,487.2 9,414.0  
Total assets 15,868.3 15,645.5 15,868.3 15,645.5  
Corporate, Other & Eliminations          
Financial information relating to segments          
Net sales (69.0) (46.6) (179.2) (140.1)  
Cost of sales (exclusive of depreciation, amortization and depletion) (72.1) (56.8) (204.1) (148.3)  
Selling, general and administrative 1.6 1.8 7.3 6.4  
Depreciation, amortization and depletion 11.8 8.5 36.3 26.2  
Exploration 0.8 2.0 5.2 6.4  
Operating income (11.0) (2.2) (23.8) (30.8)  
Capital investment 4.4 3.7 7.4 10.0  
Property and mine development, net 515.0 513.1 515.0 513.1  
Total assets 4,463.5 2,770.0 4,463.5 2,770.0  
Reportable subsegments          
Financial information relating to segments          
Net sales 3,377.3 2,930.9 9,550.2 8,649.0  
Reportable subsegments | Operating segment          
Financial information relating to segments          
Net sales 3,377.3 2,930.9 9,550.2 8,649.0  
Intersegment sales          
Financial information relating to segments          
Net sales 0.0 0.0 0.0 0.0  
Intersegment sales | Operating segment          
Financial information relating to segments          
Net sales 69.0 46.6 179.2 140.1  
Intersegment sales | Corporate, Other & Eliminations          
Financial information relating to segments          
Net sales (69.0) (46.6) (179.2) (140.1)  
Mexican Open-pit | Operating segment          
Financial information relating to segments          
Net sales 1,944.9 1,602.7 5,449.0 4,807.2  
Cost of sales (exclusive of depreciation, amortization and depletion) 763.2 612.7 2,081.9 1,870.3  
Selling, general and administrative 18.3 17.1 52.3 52.3  
Depreciation, amortization and depletion 98.6 105.4 292.8 307.7  
Exploration 1.9 1.3 4.7 7.3  
Operating income 1,062.8 866.2 3,017.3 2,569.6  
Capital investment 164.5 145.2 447.7 486.9  
Property and mine development, net 4,849.3 4,852.6 4,849.3 4,852.6  
Total assets 9,013.3 8,975.0 9,013.3 8,975.0  
Mexican Open-pit | Reportable subsegments | Operating segment          
Financial information relating to segments          
Net sales 1,905.2 1,596.7 5,409.4 4,801.1  
Mexican Open-pit | Intersegment sales | Operating segment          
Financial information relating to segments          
Net sales 39.6 6.0 39.6 6.0  
Mexican IMMSA Unit | Operating segment          
Financial information relating to segments          
Net sales 199.8 184.9 534.6 516.6  
Cost of sales (exclusive of depreciation, amortization and depletion) 126.0 123.2 372.1 362.8  
Selling, general and administrative 3.2 3.2 9.0 9.1  
Depreciation, amortization and depletion 21.6 19.3 62.2 56.7  
Exploration 2.7 2.6 8.8 7.0  
Operating income 46.3 36.6 82.5 80.9  
Capital investment 33.5 30.2 78.8 91.5  
Property and mine development, net 782.8 784.9 782.8 784.9  
Total assets 1,290.1 1,196.6 1,290.1 1,196.6  
Mexican IMMSA Unit | Reportable subsegments | Operating segment          
Financial information relating to segments          
Net sales 170.5 144.3 395.0 382.5  
Mexican IMMSA Unit | Intersegment sales | Operating segment          
Financial information relating to segments          
Net sales 29.3 40.6 139.5 134.0  
Peruvian Operations | Operating segment          
Financial information relating to segments          
Net sales 1,301.6 1,189.9 3,745.8 3,465.4  
Cost of sales (exclusive of depreciation, amortization and depletion) 539.8 543.9 1,637.8 1,544.6  
Selling, general and administrative 10.6 9.1 29.3 28.2  
Depreciation, amortization and depletion 75.8 79.9 246.4 241.1  
Exploration 4.8 7.3 17.0 23.8  
Operating income 670.7 549.7 1,815.3 1,627.6  
Capital investment 146.7 67.2 368.8 203.6  
Property and mine development, net 3,855.1 3,776.5 3,855.1 3,776.5  
Total assets 5,564.9 5,473.9 5,564.9 5,473.9  
Peruvian Operations | Reportable subsegments | Operating segment          
Financial information relating to segments          
Net sales $ 1,301.6 $ 1,189.9 $ 3,745.8 $ 3,465.3