Estimate of reasonably possible loss exposure in excess of amount accrued for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14394-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 5.Y.Q4)
-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

Name:	us-gaap_EnvironmentalExitCostsReasonablyPossibleAdditionalLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Commitments and Contingencies - Lead Refinery Site (Details) - Lead Refinery Site [Member] - Non operating Properties [Member] $ in Millions	1 Months Ended	6 Months Ended
	Sep. 30, 2014 USD ($) property	Jul. 01, 2017 USD ($)	Sep. 27, 2014 potentially_responsible_party	Jul. 17, 2009 potentially_responsible_party
Site Contingency [Line Items]
Estimated number of years until mitigation resolution		20 years
Number of parties involved in settlement negotiations \| potentially_responsible_party			2	2
EPA's estimated cost of site remediation	$ 26.0
Number of surrounding properties \| property	300
Minimum [Member]
Site Contingency [Line Items]
Mitigation estimates		$ 2.1
Maximum [Member]
Site Contingency [Line Items]
Mitigation estimates		$ 4.7