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Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Contingencies (Textual) [Abstract]
Environmental and legal losses, minimum	$ 9.1
Environmental and legal losses, maximum	28.9
Accrued liability for losses	14.9		14.6
Cash outlays related to legal and environmental matters	1.5	2.7
Wilmington Site [Member]
Site Contingency [Line Items]
Payment of environmental response costs	$ 2.0
Contribution for future response costs	5.00%

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.