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Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Period of post-closure monitoring	30 years thereafter
Potential revision on future environmental remediation costs before tax	$ 16.5
Rental expenses related to capital and operating lease	30.9	29.0	27.3
Asset retirement obligation relating to property plant and equipment	14.9	14.2
Bergheim, Germany Site [Member]
Percentage of environmental liability related to the closure and post-closure activities	70.00%
Pledged land and housing facilities	$ 5.8

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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