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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue
Sales	$ 309.6	$ 277.9	$ 598.9	$ 522.0
Point in time
Disaggregation of Revenue
Sales	252.8	178.8	495.2	343.0
Over time
Disaggregation of Revenue
Sales	56.8	99.1	103.7	179.0
Operating Segments | Energy & Chemicals
Disaggregation of Revenue
Sales	120.2	100.8	225.8	190.7
Operating Segments | Energy & Chemicals | Point in time
Disaggregation of Revenue
Sales	76.1	23.7	150.2	47.6
Operating Segments | Energy & Chemicals | Over time
Disaggregation of Revenue
Sales	44.1	77.1	75.6	143.1
Operating Segments | D&S West
Disaggregation of Revenue
Sales	115.7	117.6	233.7	218.2
Operating Segments | D&S West | Point in time
Disaggregation of Revenue
Sales	105.7	105.2	213.1	196.5
Operating Segments | D&S West | Over time
Disaggregation of Revenue
Sales	10.0	12.4	20.6	21.7
Operating Segments | D&S East
Disaggregation of Revenue
Sales	77.7	62.4	146.4	117.5
Operating Segments | D&S East | Point in time
Disaggregation of Revenue
Sales	75.0	51.5	138.9	102.0
Operating Segments | D&S East | Over time
Disaggregation of Revenue
Sales	2.7	10.9	7.5	15.5
Intersegment Eliminations
Disaggregation of Revenue
Sales	(4.0)	(2.9)	(7.0)	(4.4)
Intersegment Eliminations | Point in time
Disaggregation of Revenue
Sales	(4.0)	(1.6)	(7.0)	(3.1)
Intersegment Eliminations | Over time
Disaggregation of Revenue
Sales	$ 0.0	$ (1.3)	$ 0.0	$ (1.3)

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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