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Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 Wilmington Site [Member]	Dec. 31, 2012 Wilmington Site [Member]
Contingencies (Textual) [Abstract]
Payment of environmental response costs					$ 2.1
Contribution for future response costs				5.00%
Contingencies (Additional Textual) [Abstract]
Environmental and legal losses, minimum	10.2
Environmental and legal losses, maximum	29.0
Accrued liability for losses	15.3		15.4
Cash outlays related to legal and environmental matters	$ 0.6	$ 0.8

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.