CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
CONSOLIDATED STATEMENTS OF INCOME [Abstract]
Net sales	$ 2,118.5	$ 2,169.9	$ 2,125.5
Cost of goods sold	1,570.8	1,662.8	1,660.5
Production margin	547.7	507.1	465.0
Marketing and administrative expenses	209.2	206.0	192.1
Research and development expenses	23.0	21.2	20.4
Provision for credit losses	30.0	0.0	0.0
Restructuring and other items, net	0.0	6.9	0.0
Impairment of assets	0.0	71.7	0.0
Acquisition-related expenses	0.0	0.3	5.1
Gain on sale of assets, net	(12.3)	0.0	0.0
Litigation expenses	11.3	29.2	32.6
Income from operations	286.5	171.8	214.8
Interest expense, net	(56.4)	(59.2)	(43.9)
Debt extinguishment expenses	(1.8)	0.0	(6.9)
Non-cash pension settlement charge	0.0	0.0	(3.5)
Other non-operating deductions, net	(4.7)	(4.9)	(3.8)
Total non-operating deductions, net	(62.9)	(64.1)	(58.1)
Income before tax and equity in earnings	223.6	107.7	156.7
Provision for taxes on income	59.4	23.7	32.1
Equity in earnings of affiliates, net of tax	6.7	4.3	1.7
Net income	170.9	88.3	126.3
Less: Net income attributable to non-controlling interests	3.8	4.2	4.1
Net income attributable to Minerals Technologies Inc.	$ 167.1	$ 84.1	$ 122.2
Earnings per share:
Basic income from operations attributable to MTI (in dollars per share)	$ 5.21	$ 2.59	$ 3.74
Diluted income from operations attributable to MTI (in dollars per share)	5.17	2.58	3.73
Cash dividends declared per common share (in dollars per share)	$ 0.41	$ 0.25	$ 0.2
Shares used in computation of earnings per share:
Basic (in shares)	32.1	32.5	32.7
Diluted (in shares)	32.3	32.6	32.8