Contingencies (Details) $ in Millions	3 Months Ended
	Apr. 03, 2016 USD ($) Contract Load Case Plaintiff	Oct. 24, 2014 USD ($)	Dec. 31, 2009
Loss Contingencies [Line Items]
Number of contracts entered | Contract	2
Number of ship loads | Load	60
Default arbitration award | $	$ 70.0
Site Contingency [Line Items]
Consent decree paid by US government | $		$ 2.3
AMCOL International Corporation [Member]
Loss Contingencies [Line Items]
Ownership interest	19.00%		20.00%
Administrative Consent Order for Contamination Associated with Historic Use of PCBs [Member]
Site Contingency [Line Items]
Location of plant	Canaan, Connecticut
Estimated accrued remediation cost | $	$ 0.4
Administrative Consent Order for Installation of Groundwater Contamination System [Member]
Site Contingency [Line Items]
Location of plant	Adams, Massachusetts plant
Estimated accrued remediation cost | $	$ 0.4
Estimated cost of wastewater treatment upgrades, lower range | $	6.0
Estimated cost of wastewater treatment upgrades, upper range | $	$ 8.0
Silica Cases [Member]
Loss Contingencies [Line Items]
Number of pending cases	5
Number of cases involved in claim	1
Number of plaintiffs | Plaintiff	25
Number of cases dismissed to date	1,490
Number of new cases filed during the quarter	0
Number of lawsuits settled	1
Silica Cases [Member] | West Virginia [Member]
Loss Contingencies [Line Items]
Number of cases dismissed to date	25
Asbestos Cases [Member]
Loss Contingencies [Line Items]
Number of pending cases	15
Number of cases dismissed to date	47
Number of new cases filed during the quarter	2
Number of lawsuits settled	0
Number of allege liability	4
Number of cases with no alleged exposure	3
Asbestos Cases [Member] | West Virginia [Member]
Loss Contingencies [Line Items]
Number of cases dismissed to date	1