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SEGMENT AND RELATED INFORMATION: (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2016
USD ($)
segment
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
SEGMENT AND RELATED INFORMATION:      
Number of reportable segments | segment 3    
Financial information relating to segments      
Net sales outside of segments $ 1,245.1 $ 1,274.8  
Cost of sales (exclusive of depreciation, amortization and depletion) 726.8 679.8  
Selling, general and administrative 26.3 24.9  
Depreciation, amortization and depletion 135.3 117.0  
Exploration 10.5 10.3  
Environmental remediation   5.9  
Operating income 346.2 436.9  
Interest, net (72.8) (23.1)  
Other income (expense) (0.5) (3.7)  
Income taxes (92.3) (129.2)  
Equity earnings of affiliate 5.1 2.8  
Non-controlling interest (0.6) (1.3)  
Net income attributable to SCC 185.1 282.4  
Capital investment 223.3 248.7  
Property and mine development, net 8,400.5 7,545.6 $ 8,262.8
Total assets 12,807.7 11,090.1 $ 12,593.2
Corporate, other and eliminations      
Financial information relating to segments      
Net sales outside of segments (15.4) (18.9)  
Cost of sales (exclusive of depreciation, amortization and depletion) (40.9) (9.9)  
Selling, general and administrative 0.2 3.3  
Depreciation, amortization and depletion 6.6 2.2  
Exploration 3.7 4.6  
Operating income 15.0 (19.1)  
Capital investment 0.1 1.3  
Property and mine development, net 256.6 148.0  
Total assets (520.1) (884.5)  
Mexican Open-pit | Operating segment      
Financial information relating to segments      
Net sales outside of segments 741.9 664.2  
Cost of sales (exclusive of depreciation, amortization and depletion) 394.4 296.9  
Selling, general and administrative 13.5 9.4  
Depreciation, amortization and depletion 64.9 54.1  
Exploration 1.6 0.8  
Environmental remediation   5.9  
Operating income 267.5 297.1  
Capital investment 109.1 187.6  
Property and mine development, net 5,024.3 4,502.6  
Total assets 8,542.5 7,569.8  
Mexican IMMSA Unit | Operating segment      
Financial information relating to segments      
Net sales outside of segments 69.7 90.3  
Cost of sales (exclusive of depreciation, amortization and depletion) 68.7 89.7  
Selling, general and administrative 1.5 1.9  
Depreciation, amortization and depletion 9.4 7.7  
Exploration 1.8 2.2  
Operating income 3.7 7.7  
Capital investment 6.8 6.6  
Property and mine development, net 460.1 388.3  
Total assets 788.7 890.6  
Mexican IMMSA Unit | Intersegment sales      
Financial information relating to segments      
Net sales outside of segments 15.4 18.9  
Peruvian Operations | Operating segment      
Financial information relating to segments      
Net sales outside of segments 433.5 520.3  
Cost of sales (exclusive of depreciation, amortization and depletion) 304.6 303.1  
Selling, general and administrative 11.1 10.3  
Depreciation, amortization and depletion 54.4 53.0  
Exploration 3.4 2.7  
Operating income 60.0 151.2  
Capital investment 107.3 53.2  
Property and mine development, net 2,659.5 2,506.7  
Total assets $ 3,996.6 $ 3,514.2