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REVENUE: - Revenue by Geographical Areas (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue Recognition
Net sales	$ 2,897.0	$ 1,785.4	$ 5,429.5	$ 3,505.1
Corporate, other and eliminations
Revenue Recognition
Net sales	(38.8)	(21.5)	(65.0)	(48.3)
Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	1,632.2	1,016.7	3,110.7	1,970.4
Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	161.4	101.6	285.7	236.1
Peruvian Operations | Operating segment
Revenue Recognition
Net sales	1,142.2	688.6	2,098.1	1,346.9
Mexico
Revenue Recognition
Net sales	565.7	256.2	1,059.5	692.3
Mexico | Corporate, other and eliminations
Revenue Recognition
Net sales	(38.8)	(21.5)	(65.0)	(48.3)
Mexico | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	494.9	207.2	948.4	570.9
Mexico | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	109.6	70.5	176.1	169.7
United States
Revenue Recognition
Net sales	469.7	322.2	895.3	621.5
United States | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	393.2	298.7	782.6	556.9
United States | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	14.7	4.0	31.7	4.2
United States | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	61.8	19.5	81.0	60.4
Peru
Revenue Recognition
Net sales	143.3	42.7	290.7	118.7
Peru | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.1	2.6	0.1	5.6
Peru | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	143.2	40.1	290.6	113.1
Brazil
Revenue Recognition
Net sales	126.2	22.2	225.2	80.2
Brazil | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	5.6	1.3	7.6	4.8
Brazil | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	120.6	20.9	217.6	75.4
Chile
Revenue Recognition
Net sales	96.2	58.6	154.2	108.7
Chile | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	1.0	17.6	2.9	19.5
Chile | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	95.2	41.0	151.3	89.2
Other American countries
Revenue Recognition
Net sales	8.7	1.5	21.5	10.8
Other American countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	7.7	0.7	18.0	9.0
Other American countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales		0.6	0.7	1.4
Other American countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	1.0	0.2	2.8	0.4
Switzerland
Revenue Recognition
Net sales	440.1	399.9	833.9	653.8
Switzerland | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	318.2	236.2	612.6	408.6
Switzerland | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	18.7	15.9	25.8	30.9
Switzerland | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	103.2	147.8	195.5	214.3
Italy
Revenue Recognition
Net sales	110.0	53.1	184.0	123.3
Italy | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	0.2		0.2
Italy | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	1.1	1.0	1.9	4.4
Italy | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	108.7	52.1	181.9	118.9
Spain
Revenue Recognition
Net sales	125.7	18.2	236.6	64.8
Spain | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	102.2	18.2	193.2	64.8
Spain | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	23.5		43.4
Other European Countries
Revenue Recognition
Net sales	200.3	126.6	381.2	206.0
Other European Countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	74.7	56.1	148.1	76.4
Other European Countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	6.7	3.6	33.2	9.7
Other European Countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	118.9	66.9	199.9	119.9
Singapore
Revenue Recognition
Net sales	277.1	229.2	479.4	429.9
Singapore | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	163.4	116.2	235.0	177.9
Singapore | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	4.8	1.9	8.4	5.1
Singapore | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	108.9	111.1	236.0	246.9
Japan
Revenue Recognition
Net sales	150.6	140.4	334.7	248.5
Japan | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	2.9	2.3	24.4	11.7
Japan | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	147.7	138.1	310.3	236.8
Other Asian countries
Revenue Recognition
Net sales	183.4	114.6	333.3	146.6
Other Asian countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	73.8	63.5	145.3	74.7
Other Asian countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.1	0.2	0.2	0.3
Other Asian countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 109.5	$ 50.9	$ 187.8	$ 71.6

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