Commitments and Contingencies - Environmental and Anti-Dumping (Details) $ in Millions								1 Months Ended			9 Months Ended
	Sep. 01, 2016 $ / lb	May 25, 2016 $ / lb	May 02, 2016 company $ / lb	Oct. 05, 2015 $ / lb	Nov. 19, 2014 $ / lb	Jan. 09, 2014 $ / lb	Oct. 31, 2011 USD ($) $ / lb	Sep. 30, 2016 USD ($) $ / lb	Oct. 31, 2015 company	Feb. 28, 2013	Sep. 30, 2016 USD ($) item period	Dec. 31, 2015 USD ($)
Waterlink's Columbus, Ohio property | Accrued pension and other liabilities
Contingencies
Recorded liability for environmental loss contingencies | $								$ 0.3			$ 0.3	$ 0.3
Big Sandy Plant
Contingencies
Number of ground water monitoring wells installed | item											2
Recorded liability for environmental loss contingencies | $								$ 0.0			$ 0.0	$ 0.0
Period of Review III
Contingencies
Ongoing duty deposit rate (as a percent)						0.000	0.000
Receivable recorded for anticipated refunds of anti-dumping duties | $							$ 1.1
Tariff collection rate for cooperative respondents (in dollars per pound)						0.000	0.127
Number of separate rate respondents that challenged the results of the administrative review | company			3
Anti-dumping margins for separate rate respondents (in dollars per pound)			0.000
Period of Review VI
Contingencies
Anti-dumping margins for mandatory respondents (in dollars per pound)		0.23			0.018
Anti-dumping margins for separate rate respondents (in dollars per pound)		0.23			0.018
China-wide rate (in dollars per pound)					1.10
Period of Review VI | Calgon Carbon Tianjin
Contingencies
Anti-dumping margins for separate rate respondents (in dollars per pound)					0.018
Period of Review VII
Contingencies
Anti-dumping margins for separate rate respondents (in dollars per pound)				0.476
Number of mandatory respondents challenging the results of the administrative review | company									1
Period of Review VII | Minimum
Contingencies
Anti-dumping margins for mandatory respondents (in dollars per pound)				0.00
Period of Review VII | Maximum
Contingencies
Anti-dumping margins for mandatory respondents (in dollars per pound)				0.476
Period of Review VIII
Contingencies
Anti-dumping margins for separate rate respondents (in dollars per pound)	0.616
Period of Review VIII | Minimum
Contingencies
Anti-dumping margins for mandatory respondents (in dollars per pound)	0.009
Period of Review VIII | Maximum
Contingencies
Anti-dumping margins for mandatory respondents (in dollars per pound)	0.797
Carbon Imports - Anti-dumping duties
Contingencies
Import duty (in dollars per pound)								0.616
Prior period over which Commerce Department reviews anti-dumping tariffs											12 months
Number of periods of review | period											9
Carbon Imports - Anti-dumping duties | Minimum
Contingencies
Period for which reviews are possible										5 years