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REVENUE: - Revenue by Geographical Areas (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue Recognition
Net sales	$ 2,680.9	$ 2,129.1	$ 8,110.4	$ 5,634.2
Corporate, other and eliminations
Revenue Recognition
Net sales	(42.8)	(29.7)	(107.9)	(78.0)
Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	1,425.8	1,181.7	4,536.6	3,152.1
Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	175.1	140.9	460.8	377.0
Peruvian Operations | Operating segment
Revenue Recognition
Net sales	1,122.8	836.2	3,220.9	2,183.1
Mexico
Revenue Recognition
Net sales	560.5	374.3	1,620.1	1,066.5
Mexico | Corporate, other and eliminations
Revenue Recognition
Net sales	(42.8)	(29.7)	(107.9)	(78.0)
Mexico | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	483.1	319.5	1,431.7	890.3
Mexico | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	115.7	84.5	291.8	254.2
Mexico | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	4.5		4.5
United States
Revenue Recognition
Net sales	407.4	354.8	1,302.6	976.3
United States | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	324.9	309.9	1,107.5	866.8
United States | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	11.2	11.3	42.9	15.5
United States | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	71.3	33.6	152.2	94.0
Peru
Revenue Recognition
Net sales	147.9	99.9	438.6	218.6
Peru | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	(0.4)	4.8	(0.3)	10.4
Peru | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	148.3	95.1	438.9	208.2
Brazil
Revenue Recognition
Net sales	104.1	65.6	329.2	145.9
Brazil | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	10.9	6.7	18.4	11.6
Brazil | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	93.2	58.9	310.8	134.3
Chile
Revenue Recognition
Net sales	113.7	55.4	267.9	164.2
Chile | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	(0.1)		2.8	19.5
Chile | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	113.8	55.4	265.1	144.7
Other American countries
Revenue Recognition
Net sales	12.7	18.6	34.2	29.4
Other American countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	10.9	16.9	28.9	25.9
Other American countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales		0.7	0.7	2.1
Other American countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	1.8	1.0	4.6	1.4
Switzerland
Revenue Recognition
Net sales	423.9	446.6	1,257.8	1,100.4
Switzerland | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	276.0	274.0	888.7	682.6
Switzerland | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	20.3	19.2	46.0	50.1
Switzerland | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	127.6	153.4	323.1	367.7
Italy
Revenue Recognition
Net sales	66.8	62.2	250.9	185.4
Italy | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales			0.2
Italy | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	3.9	2.0	5.9	6.3
Italy | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	62.9	60.2	244.8	179.1
Spain
Revenue Recognition
Net sales	127.0	62.5	363.6	127.3
Spain | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	106.6	62.5	299.8	127.3
Spain | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	20.4		63.8
Other European Countries
Revenue Recognition
Net sales	172.1	136.6	553.3	342.6
Other European Countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	54.2	42.4	202.2	118.8
Other European Countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	7.0	11.0	40.3	20.7
Other European Countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	110.9	83.2	310.8	203.1
Singapore
Revenue Recognition
Net sales	285.9	192.7	765.3	622.6
Singapore | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	119.9	55.9	354.8	233.9
Singapore | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	6.3	0.6	14.8	5.7
Singapore | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	159.7	136.2	395.7	383.0
Japan
Revenue Recognition
Net sales	166.9	144.3	501.7	392.8
Japan | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	(0.8)	15.2	23.6	26.9
Japan | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	167.7	129.1	478.1	365.9
Other Asian countries
Revenue Recognition
Net sales	92.0	115.6	425.2	262.2
Other Asian countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	51.1	85.4	196.4	160.1
Other Asian countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.2	0.1	0.3	0.4
Other Asian countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 40.7	$ 30.1	$ 228.5	$ 101.7

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