CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Apr. 05, 2026	Mar. 30, 2025
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) [Abstract]
Net sales	$ 546.9	$ 491.8
Cost of goods sold	415.8	372.2
Production margin	131.1	119.6
Marketing and administrative expenses	57.5	50.6
Research and development expenses	6.1	5.8
Provision for litigation accrual and credit losses	0.0	215.0
Restructuring and other items	0.0	5.5
Litigation expenses	8.8	2.8
Income (loss) from operations	58.7	(160.1)
Interest expense, net	(13.3)	(14.2)
Other non-operating income (deductions), net	0.5	(2.0)
Total non-operating deductions, net	(12.8)	(16.2)
Income (loss) before tax and equity in earnings	45.9	(176.3)
Provision (benefit) for taxes on income	9.9	(32.1)
Equity in earnings of affiliates, net of tax	1.3	1.2
Net income (loss)	37.3	(143.0)
Less: Net income attributable to non-controlling interests	1.1	1.0
Net income (loss) attributable to Minerals Technologies Inc.	$ 36.2	$ (144.0)
Earnings (loss) per share:
Basic net income (loss) attributable to Minerals Technologies Inc. (in Dollars per share)	$ 1.17	$ (4.51)
Diluted net income (loss) attributable to Minerals Technologies Inc. (in Dollars per share)	1.17	(4.51)
Cash dividends declared per common share (in Dollars per share)	$ 0.12	$ 0.11
Shares used in computation of earnings (loss) per share:
Basic (in Shares)	31.0	31.9
Diluted (in Shares)	31.0	31.9