Segment and Related Information, Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 29, 2025 USD ($) Segment	Jun. 30, 2024 USD ($)
Segment and Related Information [Abstract]
Number of reportable segments \| Segment			2
Net sales	$ 528.9	$ 541.2	$ 1,020.7	$ 1,075.7
Cost of goods sold	392.0	397.3	764.2	795.9
Production margin	136.9	143.9	256.5	279.8
Marketing and administrative expenses	52.2	53.3	102.8	106.3
Research and development expenses	5.7	5.8	11.5	11.4
Restructuring and other items	5.8	0.0	11.3	0.0
Gain on sale of assets, net	(5.6)	0.0	(5.6)	0.0
Income (loss) from operations	74.6	50.6	(85.5)	125.8
Depreciation, depletion and amortization	22.0	24.0	45.5	47.5
Capital expenditures	29.1	20.2	47.4	36.7
Consumer & Specialties [Member]
Segment and Related Information [Abstract]
Net sales	277.7	284.3	546.0	581.2
Engineered Solutions [Member]
Segment and Related Information [Abstract]
Net sales	251.2	256.9	474.7	494.5
Operating Segments [Member]
Segment and Related Information [Abstract]
Net sales	528.9	541.2	1,020.7	1,075.7
Cost of goods sold	392.0	397.3	764.2	795.9
Production margin	136.9	143.9	256.5	279.8
Marketing and administrative expenses	50.2	49.5	99.6	99.3
Research and development expenses	5.7	5.8	11.5	11.4
Restructuring and other items	5.8	0.0	9.1	0.0
Gain on sale of assets, net	(5.6)	0.0	(5.6)	0.0
Income (loss) from operations	80.8	88.6	141.9	169.1
Operating Segments [Member] \| Consumer & Specialties [Member]
Segment and Related Information [Abstract]
Net sales	277.7	284.3	546.0	581.2
Cost of goods sold	218.1	219.6	433.8	452.9
Production margin	59.6	64.7	112.2	128.3
Marketing and administrative expenses	19.1	17.6	38.3	36.2
Research and development expenses	3.2	3.2	6.6	6.2
Restructuring and other items	3.3	0.0	5.8	0.0
Gain on sale of assets, net	0.0	0.0	0.0	0.0
Income (loss) from operations	34.0	43.9	61.5	85.9
Depreciation, depletion and amortization	10.1	12.2	20.9	23.6
Capital expenditures	18.9	12.7	30.4	19.2
Operating Segments [Member] \| Engineered Solutions [Member]
Segment and Related Information [Abstract]
Net sales	251.2	256.9	474.7	494.5
Cost of goods sold	173.9	177.7	330.4	343.0
Production margin	77.3	79.2	144.3	151.5
Marketing and administrative expenses	31.1	31.9	61.3	63.1
Research and development expenses	2.5	2.6	4.9	5.2
Restructuring and other items	2.5	0.0	3.3	0.0
Gain on sale of assets, net	(5.6)	0.0	(5.6)	0.0
Income (loss) from operations	46.8	44.7	80.4	83.2
Depreciation, depletion and amortization	11.9	11.8	24.6	23.9
Capital expenditures	8.5	6.6	14.3	15.7
Reconciling Item [Member]
Segment and Related Information [Abstract]
Restructuring and other items	0.0	0.0	2.2	0.0
Corporate [Member]
Segment and Related Information [Abstract]
Capital expenditures	$ 1.7	$ 0.9	$ 2.7	$ 1.8

MINERALS TECHNOLOGIES INC 10-Q