Segment and Related Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2015 USD ($)	Sep. 28, 2014 USD ($)	Sep. 27, 2015 USD ($) Segment	Sep. 28, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			5
Net Sales	$ 451.0	$ 543.5	$ 1,367.6	$ 1,209.0
Income from Operations	49.9	66.8	162.6	126.2
Reportable Segments [Member]
Segment Reporting Information [Line Items]
Income from Operations	53.8	72.9	176.0	148.5
Specialty Minerals [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	156.5	163.0	466.9	490.5
Income from Operations	25.0	26.0	75.2	71.4
Refractories [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	77.4	90.4	227.7	266.8
Income from Operations	7.9	9.7	24.5	29.0
Performance Materials [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	126.5	135.6	383.5	211.4
Income from Operations	22.7	18.7	72.0	23.0
Construction Technologies [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	49.7	69.1	140.7	106.3
Income from Operations	6.1	8.3	18.5	9.0
Energy Services [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	40.9	85.4	148.8	134.0
Income from Operations	$ (7.9)	$ 10.2	$ (14.2)	$ 16.1