Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Loss Contingencies [Line Items]
Period of post-closure monitoring	30 years thereafter
Potential revision on future environmental remediation costs before tax	$ 16.7
Bergheim, Germany Site [Member]
Loss Contingencies [Line Items]
Percentage of environmental liability related to the closure and post-closure activities	70.00%
Pledged land and housing facilities	$ 5.9