CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Consolidated net income	$ 45.5	$ 43.0	$ 90.4	$ 84.0
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(51.3)	2.0	(59.4)	(26.9)
Pension and postretirement plan adjustments	2.3	4.3	3.4	6.8
Unrealized gains (losses) on derivative instruments	6.2	(1.0)	9.3	3.9
Total other comprehensive income (loss), net of tax	(42.8)	5.3	(46.7)	(16.2)
Total comprehensive income including non-controlling interests	2.7	48.3	43.7	67.8
Comprehensive (income) loss attributable to non-controlling interests	1.2	(1.3)	0.4	(1.9)
Comprehensive income attributable to Minerals Technologies Inc.	$ 3.9	$ 47.0	$ 44.1	$ 65.9