CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2022	Oct. 03, 2021	Oct. 02, 2022	Oct. 03, 2021
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Consolidated net income	$ 14.6	$ 42.4	$ 105.0	$ 126.4
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(52.0)	(14.9)	(111.5)	(41.8)
Pension and postretirement plan adjustments	0.9	2.2	4.3	9.0
Unrealized gains (losses) on derivative instruments	7.1	2.6	16.4	6.5
Total other comprehensive loss, net of tax	(44.0)	(10.1)	(90.8)	(26.3)
Total comprehensive income (loss) including non-controlling interests	(29.4)	32.3	14.2	100.1
Comprehensive (income) loss attributable to non-controlling interests	(0.1)	(1.1)	0.3	(3.0)
Comprehensive income (loss) attributable to Minerals Technologies Inc.	$ (29.5)	$ 31.2	$ 14.5	$ 97.1