Segment and Related Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2016 USD ($)	Sep. 27, 2015 USD ($)	Oct. 02, 2016 USD ($) Segment	Sep. 27, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			5
Net Sales	$ 399.5	$ 451.0	$ 1,236.7	$ 1,367.6
Income from Operations	67.3	49.9	164.4	162.6
Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	399.5	451.0	1,236.7	1,367.6
Income from Operations	70.7	53.8	173.0	176.0
Specialty Minerals [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	147.3	156.5	453.5	466.9
Income from Operations	27.8	25.0	81.1	75.2
Refractories [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	63.4	77.4	206.5	227.7
Income from Operations	10.1	7.9	27.2	24.5
Performance Materials [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	119.5	126.5	367.1	383.5
Income from Operations	22.9	22.7	70.7	72.0
Construction Technologies [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	49.5	49.7	144.0	140.7
Income from Operations	7.3	6.1	21.0	18.5
Energy Services [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	19.8	40.9	65.6	148.8
Income from Operations	$ 2.6	$ (7.9)	$ (27.0)	$ (14.2)