CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2022	Oct. 03, 2021	Oct. 02, 2022	Oct. 03, 2021
CONDENSED CONSOLIDATED STATEMENTS OF INCOME [Abstract]
Net sales	$ 541.9	$ 473.2	$ 1,617.9	$ 1,381.4
Cost of goods sold	423.6	359.9	1,250.6	1,040.9
Production margin	118.3	113.3	367.3	340.5
Marketing and administrative expenses	46.0	45.5	143.6	139.9
Research and development expenses	5.1	4.6	15.2	14.5
Acquisition related transaction and integration costs	0.5	1.5	4.7	1.9
Litigation costs	31.1	0.0	32.6	0.0
Restructuring and other items, net	0.0	1.1	0.0	1.1
Income from operations	35.6	60.6	171.2	183.1
Interest expense, net	(11.0)	(9.2)	(31.2)	(28.2)
Debt extinguishment expenses	(6.9)	0.0	(6.9)	0.0
Non-cash pension settlement charge	(0.2)	(0.8)	(1.7)	(3.0)
Other non-operating income (deductions), net	(0.4)	(0.1)	(2.0)	0.3
Total non-operating deductions, net	(18.5)	(10.1)	(41.8)	(30.9)
Income before tax and equity in earnings	17.1	50.5	129.4	152.2
Provision for taxes on income	3.2	8.9	25.8	27.6
Equity in earnings of affiliates, net of tax	0.7	0.8	1.4	1.8
Consolidated net income	14.6	42.4	105.0	126.4
Less: Net income attributable to non-controlling interests	1.2	1.0	2.6	3.2
Net income attributable to Minerals Technologies Inc.	$ 13.4	$ 41.4	$ 102.4	$ 123.2
Earnings per share:
Basic: Income attributable to Minerals Technologies Inc. (in dollars per share)	$ 0.41	$ 1.24	$ 3.12	$ 3.66
Diluted: Income attributable to Minerals Technologies Inc. (in dollars per share)	0.41	1.22	3.11	3.63
Cash dividends declared per common share (in dollars per share)	$ 0.05	$ 0.05	$ 0.15	$ 0.15
Shares used in computation of earnings per share:
Basic (in shares)	32.5	33.5	32.8	33.7
Diluted (in shares)	32.6	33.8	32.9	33.9