CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CONSOLIDATED STATEMENTS OF INCOME (LOSS) [Abstract]
Net sales	$ 2,169.9	$ 2,125.5	$ 1,858.3
Cost of goods sold	1,662.8	1,660.5	1,411.8
Production margin	507.1	465.0	446.5
Marketing and administrative expenses	206.0	192.1	186.2
Research and development expenses	21.2	20.4	19.5
Impairment of assets	71.7	0.0	0.0
Acquisition-related expenses	0.3	5.1	4.0
Litigation expenses, net	29.2	32.6	0.0
Restructuring and other items, net	6.9	0.0	1.1
Income from operations	171.8	214.8	235.7
Interest expense, net	(59.2)	(43.9)	(37.2)
Debt extinguishment expenses	0.0	(6.9)	0.0
Non-cash pension settlement charge	0.0	(3.5)	(1.8)
Other non-operating deductions, net	(4.9)	(3.8)	5.6
Total non-operating deductions, net	(64.1)	(58.1)	(33.4)
Income before tax and equity in earnings	107.7	156.7	202.3
Provision for taxes on income	23.7	32.1	36.6
Equity in earnings of affiliates, net of tax	4.3	1.7	2.8
Net income	88.3	126.3	168.5
Less: Net income attributable to non-controlling interests	4.2	4.1	4.1
Net income attributable to Minerals Technologies Inc. (MTI)	$ 84.1	$ 122.2	$ 164.4
Earnings per share:
Basic income from operations attributable to MTI (in dollars per share)	$ 2.59	$ 3.74	$ 4.89
Diluted income from operations attributable to MTI (in dollars per share)	2.58	3.73	4.86
Cash dividends declared per common share (in dollars per share)	$ 0.25	$ 0.2	$ 0.2
Shares used in computation of earnings per share:
Basic (in shares)	32.5	32.7	33.6
Diluted (in shares)	32.6	32.8	33.8