CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2023	Jul. 03, 2022	Jul. 02, 2023	Jul. 03, 2022
CONDENSED CONSOLIDATED STATEMENTS OF INCOME [Abstract]
Net sales	$ 551.5	$ 557.0	$ 1,097.6	$ 1,076.1
Cost of goods sold	423.5	429.7	848.9	827.1
Production margin	128.0	127.3	248.7	249.0
Marketing and administrative expenses	51.8	48.8	104.1	97.6
Research and development expenses	5.6	5.0	10.9	10.1
Restructuring and other items, net	6.6	0.0	6.6	0.0
Acquisition-related expenses	0.2	2.6	0.3	4.2
Litigation expenses	13.9	1.5	13.9	1.5
Income from operations	49.9	69.4	112.9	135.6
Interest expense, net	(14.5)	(10.4)	(28.7)	(20.2)
Non-cash pension settlement charge	0.0	(1.5)	0.0	(1.5)
Other non-operating deductions, net	(1.4)	(1.2)	(2.5)	(1.6)
Total non-operating deductions, net	(15.9)	(13.1)	(31.2)	(23.3)
Income before tax and equity in earnings	34.0	56.3	81.7	112.3
Provision for taxes on income	7.5	11.4	18.0	22.6
Equity in earnings of affiliates, net of tax	1.1	0.6	2.0	0.7
Net income	27.6	45.5	65.7	90.4
Less: Net income attributable to non-controlling interests	1.0	0.6	2.1	1.4
Net income attributable to Minerals Technologies Inc.	$ 26.6	$ 44.9	$ 63.6	$ 89.0
Earnings per share:
Basic net income per share attributable to Minerals Technologies Inc. (in dollars per share)	$ 0.82	$ 1.37	$ 1.96	$ 2.7
Diluted net income per share attributable to Minerals Technologies Inc. (in dollars per share)	0.82	1.36	1.96	2.69
Cash dividends declared per common share (in dollars per share)	$ 0.05	$ 0.05	$ 0.1	$ 0.1
Shares used in computation of earnings per share:
Basic (in shares)	32.5	32.8	32.5	33.0
Diluted (in shares)	32.6	32.9	32.5	33.1