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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue
Sales	$ 321.1	$ 289.3
Point in time
Disaggregation of Revenue
Sales	180.0	187.3
Over time
Disaggregation of Revenue
Sales	141.1	102.0
Operating Segments | D&S East
Disaggregation of Revenue
Sales	70.0	68.7
Operating Segments | D&S East | Point in time
Disaggregation of Revenue
Sales	59.1	63.9
Operating Segments | D&S East | Over time
Disaggregation of Revenue
Sales	10.9	4.8
Operating Segments | D&S West
Disaggregation of Revenue
Sales	111.6	118.0
Operating Segments | D&S West | Point in time
Disaggregation of Revenue
Sales	102.4	107.4
Operating Segments | D&S West | Over time
Disaggregation of Revenue
Sales	9.2	10.6
Operating Segments | E&C Cryogenics
Disaggregation of Revenue
Sales	62.2	35.1
Operating Segments | E&C Cryogenics | Point in time
Disaggregation of Revenue
Sales	0.0	0.2
Operating Segments | E&C Cryogenics | Over time
Disaggregation of Revenue
Sales	62.2	34.9
Operating Segments | E&C FinFans
Disaggregation of Revenue
Sales	80.7	70.5
Operating Segments | E&C FinFans | Point in time
Disaggregation of Revenue
Sales	21.2	18.8
Operating Segments | E&C FinFans | Over time
Disaggregation of Revenue
Sales	59.5	51.7
Intersegment Eliminations
Disaggregation of Revenue
Sales	(3.4)	(3.0)
Intersegment Eliminations | Point in time
Disaggregation of Revenue
Sales	(2.7)	(3.0)
Intersegment Eliminations | Over time
Disaggregation of Revenue
Sales	$ (0.7)	$ 0.0

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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
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
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