CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
CONDENSED CONSOLIDATED STATEMENTS OF INCOME [Abstract]
Net sales	$ 546.1	$ 519.1
Cost of goods sold	425.4	397.4
Production margin	120.7	121.7
Marketing and administrative expenses	52.3	48.8
Research and development expenses	5.3	5.1
Acquisition-related expenses	0.1	1.6
Income from operations	63.0	66.2
Interest expense, net	(14.2)	(9.8)
Other non-operating (deductions) income, net	(1.1)	(0.4)
Total non-operating deductions, net	(15.3)	(10.2)
Income from operations before tax and equity in earnings	47.7	56.0
Provision for taxes on income	10.5	11.2
Equity in earnings of affiliates, net of tax	0.9	0.1
Net income	38.1	44.9
Less: Net income attributable to non-controlling interests	1.1	0.8
Net income attributable to Minerals Technologies Inc.	$ 37.0	$ 44.1
Earnings per share:
Basic net income per share attributable to Minerals Technologies Inc. (in dollars per share)	$ 1.14	$ 1.33
Diluted net income per share attributable to Minerals Technologies Inc. (in dollars per share)	1.14	1.33
Cash dividends declared per common share (in dollars per share)	$ 0.05	$ 0.05
Shares used in computation of earnings per share:
Basic (in shares)	32.5	33.1
Diluted (in shares)	32.5	33.2