Litigation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013 Case	Dec. 31, 2013 Case
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
Estimated cost of wastewater treatment upgrades, upper range		$ 8
Silica Cases [Member]
Loss Contingencies [Line Items]
Number of pending cases	72	72
Number of cases dismissed to date		1,394
Asbestos Cases [Member]
Loss Contingencies [Line Items]
Number of pending cases	15	15
Number of cases dismissed to date		34
Number of new cases	2