Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12021-110248

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Commitments and Contingencies (Details) - Applied Utility Systems Inc - Sales And Use Tax Audit - USD ($) $ in Millions	1 Months Ended
	Oct. 31, 2015	Jun. 30, 2018	Jul. 21, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss				$ 1.5
Loss contingency, original basis for determining sales taxes owed			$ 12.2
Loss contingency, adjusted basis for determining sales taxes owed			$ 9.0
Discontinued operation income tax examination settlement of case amount offered	$ 0.1
Maximum
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss		$ 0.9