Restructuring Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring Charges Total	$ 6.0	$ 0	$ 6.0	$ 0
Reduction in workforce (in hundredths)	5.00%		5.00%
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Annualized savings from reduction of workforce			12
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Annualized savings from reduction of workforce			15
Reportable Segments [Member] | Specialty Minerals [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges Total	2.2		2.2
Reportable Segments [Member] | Refractories [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges Total	0.6		0.6
Reportable Segments [Member] | Performance Materials [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges Total	1.2		1.2
Reportable Segments [Member] | Construction Technologies [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges Total	1.0		1.0
Reportable Segments [Member] | Energy Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges Total	$ 1.0		$ 1.0