CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jul. 02, 2023	Jun. 30, 2024	Jul. 02, 2023
CONDENSED CONSOLIDATED STATEMENTS OF INCOME [Abstract]
Net sales	$ 541.2	$ 551.5	$ 1,075.7	$ 1,097.6
Cost of goods sold	397.3	423.5	795.9	848.9
Production margin	143.9	128.0	279.8	248.7
Marketing and administrative expenses	53.3	51.8	106.3	104.1
Research and development expenses	5.8	5.6	11.4	10.9
Provision for credit losses	30.0	0.0	30.0	0.0
Restructuring and other items, net	0.0	6.6	0.0	6.6
Acquisition-related expenses	0.0	0.2	0.0	0.3
Litigation expenses	4.2	13.9	6.3	13.9
Income from operations	50.6	49.9	125.8	112.9
Interest expense, net	(14.9)	(14.5)	(29.8)	(28.7)
Other non-operating deductions, net	(1.1)	(1.4)	(1.3)	(2.5)
Total non-operating deductions, net	(16.0)	(15.9)	(31.1)	(31.2)
Income before tax and equity in earnings	34.6	34.0	94.7	81.7
Provision for taxes on income	15.6	7.5	29.5	18.0
Equity in earnings of affiliates, net of tax	1.9	1.1	3.3	2.0
Net income	20.9	27.6	68.5	65.7
Less: Net income attributable to non-controlling interests	1.2	1.0	2.1	2.1
Net income attributable to Minerals Technologies Inc.	$ 19.7	$ 26.6	$ 66.4	$ 63.6
Earnings per share:
Basic Net income attributable to Minerals Technologies Inc. (in dollars per share)	$ 0.61	$ 0.82	$ 2.06	$ 1.96
Diluted Net income attributable to Minerals Technologies Inc. (in dollars per share)	0.61	0.82	2.05	1.96
Cash dividends declared per common share (in dollars per share)	$ 0.1	$ 0.05	$ 0.2	$ 0.1
Shares used in computation of earnings per share:
Basic (in shares)	32.2	32.5	32.3	32.5
Diluted (in shares)	32.4	32.6	32.4	32.5