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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue
Sales	$ 357.8	$ 272.2	$ 956.7	$ 794.2
Point in time
Disaggregation of Revenue
Sales	182.7	175.4	574.7	518.4
Over time
Disaggregation of Revenue
Sales	175.1	96.8	382.0	275.8
Operating Segments | E&C Cryogenics
Disaggregation of Revenue
Sales	48.9	35.6	131.3	98.6
Operating Segments | E&C Cryogenics | Point in time
Disaggregation of Revenue
Sales	1.7	2.3	10.8	10.6
Operating Segments | E&C Cryogenics | Over time
Disaggregation of Revenue
Sales	47.2	33.3	120.5	88.0
Operating Segments | E&C FinFans
Disaggregation of Revenue
Sales	128.6	62.5	272.0	190.2
Operating Segments | E&C FinFans | Point in time
Disaggregation of Revenue
Sales	20.7	16.6	58.6	55.9
Operating Segments | E&C FinFans | Over time
Disaggregation of Revenue
Sales	107.9	45.9	213.4	134.3
Operating Segments | D&S West
Disaggregation of Revenue
Sales	114.9	119.0	344.8	337.2
Operating Segments | D&S West | Point in time
Disaggregation of Revenue
Sales	101.2	102.8	310.5	299.3
Operating Segments | D&S West | Over time
Disaggregation of Revenue
Sales	13.7	16.2	34.3	37.9
Operating Segments | D&S East
Disaggregation of Revenue
Sales	70.4	56.8	216.8	174.3
Operating Segments | D&S East | Point in time
Disaggregation of Revenue
Sales	64.1	55.0	203.0	157.0
Operating Segments | D&S East | Over time
Disaggregation of Revenue
Sales	6.3	1.8	13.8	17.3
Intersegment Eliminations
Disaggregation of Revenue
Sales	(5.0)	(1.7)	(8.2)	(6.1)
Intersegment Eliminations | Point in time
Disaggregation of Revenue
Sales	(5.0)	(1.3)	(8.2)	(4.4)
Intersegment Eliminations | Over time
Disaggregation of Revenue
Sales	$ 0.0	$ (0.4)	$ 0.0	$ (1.7)

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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
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