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SEGMENT AND RELATED INFORMATION: (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Financial information related to segments
Number of reportable segments | segment			3
Financial information relating to segments
Net sales	$ 2,680.9	$ 2,129.1	$ 8,110.4	$ 5,634.2
Cost of sales (exclusive of depreciation, amortization and depletion)	927.5	948.9	2,856.8	2,881.3
Selling, general and administrative	31.3	33.4	92.9	94.0
Depreciation, amortization and depletion	203.4	196.0	599.4	582.8
Exploration	10.9	6.9	26.7	21.8
Operating income	1,507.8	943.9	4,534.6	2,054.3
Interest, net	(87.4)	(86.4)	(262.6)	(263.0)
Other income (expense)	(1.9)	(14.0)	(7.8)	(22.4)
Income taxes	(548.6)	(338.5)	(1,703.8)	(784.7)
Equity earnings of affiliate	1.3	3.1	14.4	1.0
Non-controlling interest	(3.6)	(2.1)	(10.6)	(4.9)
Net income attributable to SCC	867.6	506.0	2,564.2	980.3
Capital investment	243.1	134.5	695.5	348.8
Property and mine development, net	9,476.1	9,144.7	9,476.1	9,144.7	$ 9,458.7
Total assets	18,110.3	16,248.4	18,110.3	16,248.4	$ 16,946.5
Intersegment sales
Financial information relating to segments
Net sales	(42.8)	(29.7)	(107.9)	(78.0)
Corporate, other and eliminations
Financial information relating to segments
Net sales	(42.8)	(29.7)	(107.9)	(78.0)
Cost of sales (exclusive of depreciation, amortization and depletion)	(48.4)	(28.2)	(122.5)	(88.2)
Selling, general and administrative	2.9	2.6	8.4	5.7
Depreciation, amortization and depletion	9.4	8.9	28.4	28.2
Exploration	5.9	2.8	11.2	7.0
Operating income	(12.6)	(15.8)	(33.4)	(30.7)
Capital investment	2.3	1.2	6.8	6.1
Property and mine development, net	656.5	369.8	656.5	369.8
Total assets	4,125.6	2,785.4	4,125.6	2,785.4
Reportable subsegments
Financial information relating to segments
Net sales	2,680.9	2,129.1	8,110.4	5,634.2
Mexican Open-pit | Operating segment
Financial information relating to segments
Net sales	1,425.8	1,181.7	4,536.6	3,152.1
Cost of sales (exclusive of depreciation, amortization and depletion)	433.4	491.0	1,441.6	1,482.4
Selling, general and administrative	17.4	19.1	49.7	55.0
Depreciation, amortization and depletion	97.8	91.0	289.0	276.0
Exploration	0.6	0.4	1.8	1.9
Operating income	876.6	580.2	2,754.5	1,336.8
Capital investment	114.6	76.0	389.6	179.7
Property and mine development, net	4,551.1	4,540.5	4,551.1	4,540.5
Total assets	8,200.6	7,551.0	8,200.6	7,551.0
Mexican Open-pit | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales	1,425.8	1,181.7	4,536.6	3,152.1
Mexican IMMSA Unit | Operating segment
Financial information relating to segments
Net sales	175.1	140.9	460.8	377.0
Cost of sales (exclusive of depreciation, amortization and depletion)	135.8	91.0	328.8	285.1
Selling, general and administrative	2.9	2.6	7.8	6.8
Depreciation, amortization and depletion	12.7	10.7	39.4	31.6
Exploration	1.7	1.8	3.8	6.9
Operating income	22.0	34.8	81.0	46.6
Capital investment	29.0	16.0	61.5	55.7
Property and mine development, net	555.5	508.1	555.5	508.1
Total assets	1,009.9	879.7	1,009.9	879.7
Mexican IMMSA Unit | Intersegment sales
Financial information relating to segments
Net sales	42.8	29.7	107.9	78.0
Mexican IMMSA Unit | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales	132.3	111.2	352.9	299.0
Peruvian Operations | Operating segment
Financial information relating to segments
Net sales	1,122.8	836.2	3,220.9	2,183.1
Cost of sales (exclusive of depreciation, amortization and depletion)	406.7	395.1	1,208.9	1,202.0
Selling, general and administrative	8.1	9.1	27.0	26.5
Depreciation, amortization and depletion	83.5	85.4	242.6	247.0
Exploration	2.7	1.9	9.9	6.0
Operating income	621.8	344.7	1,732.5	701.6
Capital investment	97.2	41.3	237.6	107.3
Property and mine development, net	3,713.0	3,726.3	3,713.0	3,726.3
Total assets	4,774.2	5,032.3	4,774.2	5,032.3
Peruvian Operations | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales	$ 1,122.8	$ 836.2	$ 3,220.9	$ 2,183.1

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