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REVENUE: - Revenue by Geographical Areas (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenue Recognition
Net sales	$ 3,051.0	$ 3,118.3	$ 6,172.9	$ 5,718.1
Operating segment
Revenue Recognition
Net sales	3,112.3	3,170.5	6,283.1	5,811.4
Corporate & Elimination
Revenue Recognition
Net sales	(61.3)	(52.1)	(110.2)	(93.4)
Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	1,754.8	1,738.5	3,504.2	3,204.4
Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	179.3	185.2	334.7	331.6
Peruvian Operations | Operating segment
Revenue Recognition
Net sales	1,178.2	1,246.7	2,444.2	2,275.4
Maximum
Revenue Recognition
Net sales				0.1
Mexico
Revenue Recognition
Net sales	804.7	743.8	1,617.8	1,416.1
Mexico | Operating segment
Revenue Recognition
Net sales	865.7	785.1	1,727.1	1,490.4
Mexico | Corporate & Elimination
Revenue Recognition
Net sales	(61.0)	(41.3)	(109.3)	(74.3)
Mexico | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	714.7	654.7	1,439.9	1,246.0
Mexico | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	151.1	121.0	287.0	227.2
Mexico | Peruvian Operations | Operating segment
Revenue Recognition
Net sales		9.3	0.2	17.2
United States
Revenue Recognition
Net sales	356.0	389.2	765.1	701.8
United States | Operating segment
Revenue Recognition
Net sales	356.0	389.2	765.1	701.8
United States | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	277.6	325.4	563.6	597.6
United States | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	0.2	0.3	0.2	2.0
United States | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	78.2	63.5	201.3	102.2
Peru
Revenue Recognition
Net sales	212.9	167.9	437.8	334.0
Peru | Operating segment
Revenue Recognition
Net sales	213.2	178.7	438.7	353.1
Peru | Corporate & Elimination
Revenue Recognition
Net sales	(0.2)	(10.8)	(0.9)	(19.1)
Peru | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	(0.2)	10.6	1.0	19.0
Peru | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	213.4	168.2	437.8	334.1
Brazil
Revenue Recognition
Net sales	162.1	141.0	299.5	265.9
Brazil | Operating segment
Revenue Recognition
Net sales	162.1	141.0	299.5	265.9
Brazil | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	8.3	13.1	15.5	22.0
Brazil | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	153.9	127.9	283.9	243.9
Chile
Revenue Recognition
Net sales	132.1	131.9	241.7	226.4
Chile | Operating segment
Revenue Recognition
Net sales	132.1	131.9	241.7	226.4
Chile | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	132.1	131.9	241.7	226.4
Other American countries
Revenue Recognition
Net sales	18.8	20.7	32.4	32.0
Other American countries | Operating segment
Revenue Recognition
Net sales	18.8	20.7	32.4	32.0
Other American countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	10.8	13.5	22.4	20.7
Other American countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	8.0	7.2	10.0	11.3
Switzerland
Revenue Recognition
Net sales	424.2	374.6	817.9	603.6
Switzerland | Operating segment
Revenue Recognition
Net sales	424.2	374.6	817.9	603.6
Switzerland | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	221.6	152.3	441.3	314.1
Switzerland | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	15.1	25.4	20.7	40.7
Switzerland | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	187.5	196.9	355.9	248.9
Italy
Revenue Recognition
Net sales	112.8	114.8	218.2	196.1
Italy | Operating segment
Revenue Recognition
Net sales	112.8	114.8	218.2	196.1
Italy | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	3.8	6.4	9.1	12.5
Italy | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	109.0	108.4	209.1	183.7
Spain
Revenue Recognition
Net sales	163.1	157.1	322.8	287.2
Spain | Operating segment
Revenue Recognition
Net sales	163.1	157.1	322.8	287.2
Spain | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	136.6	131.3	245.3	241.6
Spain | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	26.5	25.8	77.5	45.7
Other European Countries
Revenue Recognition
Net sales	81.7	165.6	271.7	332.4
Other European Countries | Operating segment
Revenue Recognition
Net sales	81.7	165.6	271.7	332.4
Other European Countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	0.7	29.0	3.7	87.6
Other European Countries | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales	1.1	4.0	1.2	5.4
Other European Countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	79.9	132.5	266.7	239.4
China
Revenue Recognition
Net sales	232.8	397.3	516.4	683.7
China | Operating segment
Revenue Recognition
Net sales	232.8	397.3	516.4	683.7
China | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	225.2	334.7	504.9	510.3
China | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales		2.4		3.5
China | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	7.6	60.2	11.5	169.9
Singapore
Revenue Recognition
Net sales	48.2	76.3	91.2	133.6
Singapore | Operating segment
Revenue Recognition
Net sales	48.2	76.3	91.2	133.6
Singapore | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	22.5	45.7	41.7	63.3
Singapore | Mexican IMMSA Unit | Operating segment
Revenue Recognition
Net sales		2.0		(0.6)
Singapore | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	25.7	28.6	49.5	70.9
Japan
Revenue Recognition
Net sales	272.0	182.5	487.5	427.5
Japan | Operating segment
Revenue Recognition
Net sales	272.0	182.5	487.5	427.5
Japan | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	125.5	27.2	207.2	81.3
Japan | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	146.4	155.3	280.3	346.2
Other Asian countries
Revenue Recognition
Net sales	29.6	55.6	53.1	77.7
Other Asian countries | Operating segment
Revenue Recognition
Net sales	29.6	55.6	53.1	77.7
Other Asian countries | Mexican Open-pit | Operating segment
Revenue Recognition
Net sales	19.5	24.7	34.2	42.0
Other Asian countries | Peruvian Operations | Operating segment
Revenue Recognition
Net sales	$ 10.1	$ 30.9	$ 19.0	$ 35.6

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