CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income (loss)	$ (14.0)	$ 170.9	$ 88.3
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	38.5	(49.9)	(6.1)
Pension and postretirement plan adjustments	8.4	30.6	5.6
Unrealized gain (loss) on cash flow hedges	(0.4)	0.3	(3.3)
Total other comprehensive income (loss), net of tax	46.5	(19.0)	(3.8)
Total comprehensive income including non-controlling interests	32.5	151.9	84.5
Less: Net income attributable to non-controlling interests	4.4	3.8	4.2
Less: Foreign currency translation adjustments attributable to non-controlling interests	(0.2)	(1.3)	(0.9)
Comprehensive income attributable to non-controlling interests	4.2	2.5	3.3
Comprehensive income attributable to Minerals Technologies Inc.	$ 28.3	$ 149.4	$ 81.2