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SEGMENT AND RELATED INFORMATION: (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Financial information related to segments
Number of reportable segments | segment			3
Financial information relating to segments
Net sales	$ 1,837.2	$ 1,529.8	$ 3,678.4	$ 3,113.8
Cost of sales (exclusive of depreciation, amortization and depletion)	851.7	804.8	1,728.2	1,648.6
Selling, general and administrative	26.2	22.2	50.3	43.6
Depreciation, amortization and depletion	162.6	171.2	324.6	324.6
Exploration	9.1	5.7	14.3	10.8
Environmental remediation				(10.2)
Operating income	787.6	525.9	1,561.0	1,096.4
Interest, net	(65.8)	(71.7)	(132.5)	(161.6)
Other income (expense)	(3.1)	3.1	(5.5)	7.8
Income taxes	(309.1)	(160.3)	(545.7)	(336.6)
Equity earnings of affiliate	1.5	3.5	5.6	9.7
Non-controlling interest	(1.5)	(0.8)	(2.6)	(1.6)
Net income attributable to SCC	409.6	299.7	880.3	614.1
Capital investment	253.9	252.1	549.6	497.7
Property and mine development, net	9,172.6	8,837.5	9,172.6	8,837.5	$ 9,099.6
Total assets	14,045.9	13,515.3	14,045.9	13,515.3	$ 13,780.1
Corporate, other and eliminations
Financial information relating to segments
Net sales	(18.8)	(17.6)	(38.4)	(38.1)
Cost of sales (exclusive of depreciation, amortization and depletion)	(21.5)	(21.6)	(41.7)	(41.4)
Selling, general and administrative	1.0	0.6	1.4	0.8
Depreciation, amortization and depletion	11.7	1.6	18.4	7.7
Exploration	0.5	1.9	1.2	3.7
Operating income	(10.5)	(0.1)	(17.7)	(9.0)
Capital investment	16.6	1.6	18.7	1.8
Property and mine development, net	739.8	229.0	739.8	229.0
Total assets	876.0	(659.1)	876.0	(659.1)
Mexican Open-pit
Financial information relating to segments
Net sales	1,061.1	899.8	2,129.7	1,852.0
Mexican Open-pit | Operating segment
Financial information relating to segments
Net sales	1,061.1	899.8	2,129.7	1,852.0
Cost of sales (exclusive of depreciation, amortization and depletion)	404.7	391.5	816.1	856.4
Selling, general and administrative	13.7	11.1	25.6	21.1
Depreciation, amortization and depletion	81.9	100.0	174.4	198.6
Exploration	0.5	0.7	1.1	1.2
Environmental remediation				(10.2)
Operating income	560.3	396.5	1,112.5	784.9
Capital investment	79.5	88.8	144.2	146.1
Property and mine development, net	4,490.7	5,149.8	4,490.7	5,149.8
Total assets	7,659.1	8,660.5	7,659.1	8,660.5
Mexican IMMSA Unit
Financial information relating to segments
Net sales	134.3	107.3	264.0	217.6
Mexican IMMSA Unit | Operating segment
Financial information relating to segments
Net sales	153.1	124.9	302.4	255.7
Cost of sales (exclusive of depreciation, amortization and depletion)	100.9	91.4	196.4	174.4
Selling, general and administrative	2.5	2.0	4.9	4.2
Depreciation, amortization and depletion	11.1	12.5	22.1	25.9
Exploration	1.2	0.9	2.5	1.6
Operating income	37.4	18.1	76.5	49.6
Capital investment	9.8	6.0	22.4	13.0
Property and mine development, net	433.2	376.0	433.2	376.0
Total assets	951.2	868.3	951.2	868.3
Mexican IMMSA Unit | Intersegment sales
Financial information relating to segments
Net sales	18.8	17.6	38.4	38.1
Peruvian Operations
Financial information relating to segments
Net sales	641.8	522.7	1,284.7	1,044.2
Peruvian Operations | Operating segment
Financial information relating to segments
Net sales	641.8	522.7	1,284.7	1,044.2
Cost of sales (exclusive of depreciation, amortization and depletion)	367.6	343.5	757.4	659.2
Selling, general and administrative	9.0	8.5	18.4	17.5
Depreciation, amortization and depletion	57.9	57.1	109.7	92.4
Exploration	6.9	2.2	9.5	4.3
Operating income	200.4	111.4	389.7	270.8
Capital investment	148.0	155.7	364.3	336.8
Property and mine development, net	3,508.9	3,082.7	3,508.9	3,082.7
Total assets	$ 4,559.6	$ 4,645.6	$ 4,559.6	$ 4,645.6

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