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SEGMENT AND RELATED INFORMATION: (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Financial information related to segments
Number of reportable segments | segment			3
Financial information relating to segments
Net sales	$ 1,723.7	$ 1,676.5	$ 5,402.1	$ 4,790.2
Cost of sales (exclusive of depreciation, amortization and depletion)	824.0	781.5	2,552.2	2,430.2
Selling, general and administrative	26.4	25.0	76.7	68.6
Depreciation, amortization and depletion	170.6	169.3	495.2	493.8
Exploration	6.0	8.1	20.3	18.9
Environmental remediation				(10.2)
Operating income	696.7	692.6	2,257.7	1,788.9
Interest, net	(64.8)	(69.8)	(197.2)	(231.4)
Other income (expense)	(7.6)	(6.2)	(13.1)	1.6
Income taxes	(257.9)	(220.1)	(803.6)	(556.6)
Equity earnings of affiliate	4.3	6.3	9.9	16.1
Non-controlling interest	(1.3)	(1.0)	(3.9)	(2.6)
Net income attributable to SCC	369.4	401.8	1,249.8	1,016.0
Capital investment	282.3	212.7	831.8	710.4
Property and mine development, net	9,311.8	8,928.3	9,311.8	8,928.3	$ 9,099.6
Total assets	14,316.7	13,982.4	14,316.7	13,982.4	$ 13,780.1
Corporate, other and eliminations
Financial information relating to segments
Net sales	(17.2)	(16.0)	(55.6)	(54.1)
Cost of sales (exclusive of depreciation, amortization and depletion)	(18.8)	(16.5)	(60.5)	(57.8)
Selling, general and administrative	0.2	(0.7)	1.6	0.1
Depreciation, amortization and depletion	2.4	4.0	20.8	11.6
Exploration	2.3	0.6	3.5	4.3
Operating income	(3.3)	(3.4)	(21.0)	(12.3)
Capital investment	0.7	1.1	19.4	2.9
Property and mine development, net	553.3	246.3	553.3	246.3
Total assets	465.0	14.9	465.0	14.9
Mexican Open-pit
Financial information relating to segments
Net sales	995.1	1,023.3	3,124.9	2,875.3
Mexican Open-pit | Operating segment
Financial information relating to segments
Net sales	995.1	1,023.3	3,124.9	2,875.3
Cost of sales (exclusive of depreciation, amortization and depletion)	398.8	373.6	1,214.8	1,230.0
Selling, general and administrative	15.8	15.3	41.4	36.4
Depreciation, amortization and depletion	95.1	97.1	269.5	295.7
Exploration	0.4	0.7	1.5	1.9
Environmental remediation				(10.2)
Operating income	485.0	536.6	1,597.7	1,321.5
Capital investment	53.7	71.6	197.9	217.7
Property and mine development, net	4,579.5	5,109.2	4,579.5	5,109.2
Total assets	8,122.7	8,466.8	8,122.7	8,466.8
Mexican IMMSA Unit
Financial information relating to segments
Net sales	90.1	87.5	354.0	305.0
Mexican IMMSA Unit | Operating segment
Financial information relating to segments
Net sales	107.3	103.5	409.6	359.1
Cost of sales (exclusive of depreciation, amortization and depletion)	74.7	73.8	271.2	248.2
Selling, general and administrative	1.9	1.5	6.8	5.7
Depreciation, amortization and depletion	11.5	13.1	33.6	39.0
Exploration	1.1	1.9	3.6	3.5
Operating income	18.1	13.2	94.4	62.7
Capital investment	10.2	12.8	32.6	25.8
Property and mine development, net	433.4	374.1	433.4	374.1
Total assets	974.1	887.2	974.1	887.2
Mexican IMMSA Unit | Intersegment sales
Financial information relating to segments
Net sales	17.2	16.0	55.6	54.1
Peruvian Operations
Financial information relating to segments
Net sales	638.5	565.7	1,923.2	1,609.9
Peruvian Operations | Operating segment
Financial information relating to segments
Net sales	638.5	565.7	1,923.2	1,609.9
Cost of sales (exclusive of depreciation, amortization and depletion)	369.3	350.6	1,126.7	1,009.8
Selling, general and administrative	8.5	8.9	26.9	26.4
Depreciation, amortization and depletion	61.6	55.1	171.3	147.5
Exploration	2.2	4.9	11.7	9.2
Operating income	196.9	146.2	586.6	417.0
Capital investment	217.7	127.2	581.9	464.0
Property and mine development, net	3,745.6	3,198.7	3,745.6	3,198.7
Total assets	$ 4,754.9	$ 4,613.5	$ 4,754.9	$ 4,613.5

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