Segment and Related Information, Sales By Product Category (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2022	Oct. 03, 2021	Oct. 02, 2022	Oct. 03, 2021
Segment and Related Information [Abstract]
Net sales	$ 541.9	$ 473.2	$ 1,617.9	$ 1,381.4
Household, Personal Care & Specialty Products [Member]
Segment and Related Information [Abstract]
Net sales	141.5	121.8	424.1	333.9
Metalcasting [Member]
Segment and Related Information [Abstract]
Net sales	85.4	72.9	254.4	235.0
Environmental Products [Member]
Segment and Related Information [Abstract]
Net sales	47.7	39.8	138.0	105.8
Building Materials [Member]
Segment and Related Information [Abstract]
Net sales	15.8	15.9	45.6	45.0
Paper PCC [Member]
Segment and Related Information [Abstract]
Net sales	97.7	89.5	286.4	264.9
Specialty PCC [Member]
Segment and Related Information [Abstract]
Net sales	25.5	18.2	77.7	57.1
Ground Calcium Carbonate [Member]
Segment and Related Information [Abstract]
Net sales	28.6	25.0	84.0	74.5
Talc [Member]
Segment and Related Information [Abstract]
Net sales	14.2	14.2	45.2	40.9
Refractory Products [Member]
Segment and Related Information [Abstract]
Net sales	68.9	58.3	203.9	175.1
Metallurgical Products [Member]
Segment and Related Information [Abstract]
Net sales	$ 16.6	$ 17.6	$ 58.6	$ 49.2