CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
CONSOLIDATED STATEMENTS OF INCOME (LOSS) [Abstract]
Net sales	$ 2,072.6	$ 2,118.5	$ 2,169.9
Cost of goods sold	1,554.6	1,570.8	1,662.8
Production margin	518.0	547.7	507.1
Marketing and administrative expenses	208.0	209.2	206.0
Research and development expenses	22.9	23.0	21.2
Provision for litigation accrual and credit losses	215.0	30.0	0.0
Restructuring and other items	15.0	0.0	6.9
Impairment of assets	0.0	0.0	71.7
Acquisition-related expenses	0.0	0.0	0.3
Gain on sale of assets, net	(9.9)	(12.3)	0.0
Litigation expenses	19.6	11.3	29.2
Income from operations	47.4	286.5	171.8
Interest expense, net	(54.5)	(56.4)	(59.2)
Debt extinguishment expenses	0.0	(1.8)	0.0
Other non-operating deductions, net	(6.9)	(4.7)	(4.9)
Total non-operating deductions, net	(61.4)	(62.9)	(64.1)
Income (loss) before tax and equity in earnings	(14.0)	223.6	107.7
Provision for taxes on income	4.9	59.4	23.7
Equity in earnings of affiliates, net of tax	4.9	6.7	4.3
Net income (loss)	(14.0)	170.9	88.3
Less: Net income attributable to non-controlling interests	4.4	3.8	4.2
Net income (loss) attributable to Minerals Technologies Inc. (MTI)	$ (18.4)	$ 167.1	$ 84.1
Earnings (loss) per share:
Basic net income (loss) attributable to Minerals Technologies Inc. (in Dollars per share)	$ (0.59)	$ 5.21	$ 2.59
Diluted net income (loss) attributable to Minerals Technologies Inc. (in Dollars per share)	(0.59)	5.17	2.58
Cash dividends declared per common share (in Dollars per share)	$ 0.45	$ 0.41	$ 0.25
Shares used in computation of earnings (loss) per share:
Basic (in Shares)	31.4	32.1	32.5
Diluted (in Shares)	31.4	32.3	32.6