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SEGMENT AND RELATED INFORMATION: (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2017 USD ($)
Financial information related to segments
Number of reportable segments | segment	3
Financial information relating to segments
Net sales	$ 1,841.1	$ 1,583.9
Cost of sales (exclusive of depreciation, amortization and depletion)	876.5	843.8
Selling, general and administrative	24.1	21.4
Depreciation, amortization and depletion	162.0	153.4
Exploration	5.2	5.1
Environmental remediation		(10.2)
Operating income	773.3	570.4
Interest, net	(66.6)		$ (89.9)
Other income (expense)	(2.3)	4.8
Income taxes	(236.6)	(176.2)
Equity earnings of affiliate, net of income tax	4.1	6.2
Non-controlling interest	(1.2)	(0.9)
Net income attributable to SCC	470.7	314.4
Capital investment	295.7	245.6
Property and mine development, net	9,118.5	8,755.9		$ 9,099.6
Total assets	14,038.1	13,523.0		$ 13,780.1
Corporate, other and eliminations
Financial information relating to segments
Net sales	(19.6)	(20.6)
Cost of sales (exclusive of depreciation, amortization and depletion)	(20.2)	(19.7)
Selling, general and administrative	0.4	0.2
Depreciation, amortization and depletion	6.7	6.1
Exploration	0.7	1.8
Operating income	(7.2)	(9.0)
Capital investment	2.1	0.2
Property and mine development, net	663.0	222.3
Total assets	367.3	(238.7)
Mexican Open-pit
Financial information relating to segments
Net sales	1,068.6	952.2
Mexican Open-pit | Operating segment
Financial information relating to segments
Net sales	1,068.6	952.2
Cost of sales (exclusive of depreciation, amortization and depletion)	411.3	464.8
Selling, general and administrative	11.9	10.0
Depreciation, amortization and depletion	92.5	98.6
Exploration	0.6	0.5
Environmental remediation		(10.2)
Operating income	552.3	388.5
Capital investment	64.7	57.3
Property and mine development, net	4,577.4	5,171.1
Total assets	8,338.7	8,481.7
Mexican IMMSA Unit
Financial information relating to segments
Net sales	129.6	110.2
Mexican IMMSA Unit | Operating segment
Financial information relating to segments
Net sales	149.2	130.8
Cost of sales (exclusive of depreciation, amortization and depletion)	95.6	83.0
Selling, general and administrative	2.4	2.2
Depreciation, amortization and depletion	11.0	13.4
Exploration	1.3	0.7
Operating income	38.9	31.5
Capital investment	12.6	7.0
Property and mine development, net	434.6	375.9
Total assets	950.1	889.0
Mexican IMMSA Unit | Intersegment sales
Financial information relating to segments
Net sales	19.6	20.6
Peruvian Operations
Financial information relating to segments
Net sales	642.9	521.5
Peruvian Operations | Operating segment
Financial information relating to segments
Net sales	642.9	521.5
Cost of sales (exclusive of depreciation, amortization and depletion)	389.8	315.7
Selling, general and administrative	9.4	9.0
Depreciation, amortization and depletion	51.8	35.3
Exploration	2.6	2.1
Operating income	189.3	159.4
Capital investment	216.3	181.1
Property and mine development, net	3,443.5	2,986.6
Total assets	$ 4,382.0	$ 4,391.0

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