Litigation (Details) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 17, 2017 Case	Dec. 31, 2016 USD ($) Case	Dec. 31, 2016 USD ($) Contract Load Case	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 awards | $			$ 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%	19.00%		20.00%
Silica Cases [Member]
Loss Contingencies [Line Items]
Number of pending cases		3	3
Cumulative number of cases dismissed			1,492
Number of claims closed		0	27
Number of lawsuits settled			1
Asbestos Cases [Member]
Loss Contingencies [Line Items]
Number of pending cases		18	18
Cumulative number of cases dismissed			48
Number of claims closed		0	2
Number of new cases filed		3	6
Number of lawsuits settled			0
Number of allege liability			2
Asbestos Cases [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Number of new cases filed	1
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	$ 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	$ 0.4
Estimated cost of wastewater treatment upgrades, lower range | $			6.0
Estimated cost of wastewater treatment upgrades, upper range | $			$ 8.0