Reportable Segments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011 Display Technologies [Member]	Dec. 31, 2011 Telecommunications [Member]	Dec. 31, 2011 Environmental Technologies [Member]	Dec. 31, 2011 Specialty Materials [Member]	Dec. 31, 2011 Life Sciences [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for ten percent or more of each segment's sales		4	1	3	2	2
Percent of total segment sales		77.00%	12.00%	85.00%	42.00%	39.00%
Excluded amount from sales	$ 365