Commitments And Contingencies (Details) (USD $) In Millions		1 Months Ended	0 Months Ended
Jun. 30, 2011	Jan. 31, 2010 Entire Site [Member]	Jan. 26, 2011 Limited Number Of Remedial Alternatives [Member]	Jul. 05, 2011 Off-Site [Member]
Estimated cost, minimum		$ 0.7	$ 7.9
Estimated cost, maximum		8.2	10.5
Estimated cost				9.5
Accrual amount	$ 4.8

High-end of the range estimate of the loss exposure for reasonably possible environmental contingencies at an individual site for which no accrual has been recorded.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 96-1
-Paragraph 163, 166
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 10
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859

Name:	us-gaap_SiteContingencyLossExposureNotAccruedHighEstimate
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration