Commitments and Contingencies (Details) (USD $)	1 Months Ended		3 Months Ended	5 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Oct. 13, 2010 County	May 31, 2007 Company mi	Mar. 31, 2011	Jun. 06, 2008 Well	Jun. 30, 2012 Complaint	Sep. 30, 2011	Dec. 31, 2009 Entity	Jun. 28, 2012 Company	May 25, 2012 Director	May 18, 2010
Commitments and Contingencies (Textual)
Number of putative class-action complaints					4
Number of complaints filed					4
Claims against damages, IDOT/Joliet Road lawsuit										$ 40,000,000
Settlement awarded			25,546,000			24,111,000
Number of former directors in Ireland lawsuit									2
Number of wells at issue				244
Number of wells at issue as a result of the discovery to date				13
Number of cases in mass tort action	over 100
Number of counties that cases were filed in the mass tort action	17
Number of other parties sued in the Lower Passaic River Clean-Up							300
Number of other companies to perform a Remedial Investigation/Feasibility Study related to the Lower Passaic River Clean-Up lawsuit		70
Number of miles of the River used in the Remedial Investigation/Feasibility Study		17
Range of estimated cost, minimum					900,000,000
Range of estimated cost, maximum					$ 2,300,000,000
Number of other companies entered into agreement related to the Lower Passaic River Clean-Up								69