CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statements of Income [Abstract]
Net sales	$ 2,125.5	$ 1,858.3	$ 1,594.8
Cost of goods sold	1,660.5	1,411.8	1,189.4
Production margin	465.0	446.5	405.4
Marketing and administrative expenses	192.1	186.2	176.5
Research and development expenses	20.4	19.5	19.9
Acquisition-related expenses	5.1	4.0	3.1
Litigation expenses	32.6	0.0	10.4
Restructuring and other items, net	0.0	1.1	7.6
Income from operations	214.8	235.7	187.9
Interest expense, net	(43.9)	(37.2)	(38.2)
Debt extinguishment expenses	(6.9)	0.0	0.0
Non-cash pension settlement charge	(3.5)	(1.8)	(6.4)
Other non-operating income (deductions), net	(3.8)	5.6	(5.3)
Total non-operating deductions, net	(58.1)	(33.4)	(49.9)
Income before tax and equity in earnings	156.7	202.3	138.0
Provision for taxes on income	32.1	36.6	24.4
Equity in earnings of affiliates, net of tax	1.7	2.8	2.2
Consolidated net income	126.3	168.5	115.8
Less: Net income attributable to non-controlling interests	4.1	4.1	3.4
Net income attributable to Minerals Technologies Inc. (MTI)	$ 122.2	$ 164.4	$ 112.4
Basic:
Income from operations attributable to MTI (in dollars per share)	$ 3.74	$ 4.89	$ 3.29
Diluted:
Income from operations attributable to MTI (in dollars per share)	3.73	4.86	3.29
Cash dividends declared per common share (in dollars per share)	$ 0.2	$ 0.2	$ 0.2
Shares used in computation of earnings per share:
Basic (in shares)	32.7	33.6	34.2
Diluted (in shares)	32.8	33.8	34.2