CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 30, 2025	Mar. 31, 2024
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) [Abstract]
Net sales	$ 491.8	$ 534.5
Cost of goods sold	372.2	398.6
Production margin	119.6	135.9
Marketing and administrative expenses	50.6	53.0
Research and development expenses	5.8	5.6
Provision for litigation reserve	215.0	0.0
Restructuring and other items, net	5.5	0.0
Litigation expenses	2.8	2.1
Income (loss) from operations	(160.1)	75.2
Interest expense, net	(14.2)	(14.9)
Other non-operating deductions, net	(2.0)	(0.2)
Total non-operating deductions, net	(16.2)	(15.1)
Income (loss) before tax and equity in earnings	(176.3)	60.1
Provision (benefit) for taxes on income	(32.1)	13.9
Equity in earnings of affiliates, net of tax	1.2	1.4
Net income (loss)	(143.0)	47.6
Less: Net income attributable to non-controlling interests	1.0	0.9
Net income (loss) attributable to Minerals Technologies Inc.	$ (144.0)	$ 46.7
Earnings (loss) per share:
Basic net income (loss) attributable to Minerals Technologies Inc. (in dollars per share)	$ (4.51)	$ 1.45
Diluted net income (loss) attributable to Minerals Technologies Inc. (in dollars per share)	(4.51)	1.44
Cash dividends declared per common share (in dollars per share)	$ 0.11	$ 0.1
Shares used in computation of earnings per share:
Basic (in shares)	31.9	32.3
Diluted (in shares)	31.9	32.4