CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
CONDENSED CONSOLIDATED STATEMENTS OF INCOME [Abstract]
Net sales	$ 534.5	$ 546.1
Cost of goods sold	398.6	425.4
Production margin	135.9	120.7
Marketing and administrative expenses	53.0	52.3
Research and development expenses	5.6	5.3
Acquisition-related expenses	0.0	0.1
Litigation expenses	2.1	0.0
Income from operations	75.2	63.0
Interest expense, net	(14.9)	(14.2)
Other non-operating (deductions) income, net	(0.2)	(1.1)
Total non-operating deductions, net	(15.1)	(15.3)
Income before tax and equity in earnings	60.1	47.7
Provision for taxes on income	13.9	10.5
Equity in earnings of affiliates, net of tax	1.4	0.9
Net income	47.6	38.1
Less: Net income attributable to non-controlling interests	0.9	1.1
Net income attributable to Minerals Technologies Inc.	$ 46.7	$ 37.0
Earnings per share:
Basic Net income attributable to Minerals Technologies Inc. (in dollars per share)	$ 1.45	$ 1.14
Diluted Net income attributable to Minerals Technologies Inc. (in dollars per share)	1.44	1.14
Cash dividends declared per common share (in dollars per share)	$ 0.1	$ 0.05
Shares used in computation of earnings per share:
Basic (in shares)	32.3	32.5
Diluted (in shares)	32.4	32.5