CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2023	Jul. 03, 2022	Jul. 02, 2023	Jul. 03, 2022
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income	$ 27.6	$ 45.5	$ 65.7	$ 90.4
Other comprehensive loss, net of tax:
Foreign currency translation adjustments	(26.1)	(51.3)	(16.0)	(59.4)
Pension and postretirement plan adjustments	0.4	2.3	0.9	3.4
Unrealized gains (losses) on derivative instruments	0.5	6.2	(1.9)	9.3
Total other comprehensive loss, net of tax	(25.2)	(42.8)	(17.0)	(46.7)
Total comprehensive income including non-controlling interests	2.4	2.7	48.7	43.7
Comprehensive income (loss) attributable to non-controlling interests	0.1	1.2	(1.3)	0.4
Comprehensive income attributable to Minerals Technologies Inc.	$ 2.5	$ 3.9	$ 47.4	$ 44.1