Reportable Segments (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Display Technologies [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	4	4
Percent of total segment sales	78.00%	79.00%
Telecommunications [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	1	1
Percent of total segment sales	12.00%	12.00%
Segment assets	$ 1,400,000,000	$ 1,400,000,000	$ 1,200,000,000
Capital expenditures		$ 170,000,000
Environmental Technologies [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	3	3
Percent of total segment sales	87.00%	87.00%
Specialty Materials [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	2	2
Percent of total segment sales	48.00%	49.00%
Life Sciences [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	2	2
Percent of total segment sales	45.00%	42.00%