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Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012 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	10.3
Environmental and legal losses, maximum	28.9
Accrued liability for losses	15.4	14.6
Cash outlays related to legal and environmental matters	$ 3.3	$ 4.9

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.