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Reportable Segments - Assets (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Assets
Assets	$ 1,738.5	$ 1,724.7
Discontinued Operations
Assets
Assets	123.4	104.9
Operating Segments | Continuing Operations | Energy & Chemicals
Assets
Assets	755.4	784.1
Operating Segments | Continuing Operations | D&S West
Assets
Assets	435.0	415.7
Operating Segments | Continuing Operations | D&S East
Assets
Assets	321.2	327.3
Corporate | Continuing Operations
Assets
Assets	$ 103.5	$ 92.7

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

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+ References

No definition available.

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