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Revenue - Disaggregation by Timing (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue
Sales to external customers	$ 342.4	$ 357.8	$ 309.6	$ 289.3	$ 290.1	$ 272.2	$ 277.9	$ 244.1	$ 1,299.1	$ 1,084.3	$ 842.9
Point in time
Disaggregation of Revenue
Sales to external customers									768.7	758.2
Over time
Disaggregation of Revenue
Sales to external customers									530.4	326.1
Operating Segments | D&S East
Disaggregation of Revenue
Sales to external customers									293.4	246.3	232.3
Operating Segments | D&S East | Point in time
Disaggregation of Revenue
Sales to external customers									272.2	222.9
Operating Segments | D&S East | Over time
Disaggregation of Revenue
Sales to external customers									21.2	23.4
Operating Segments | D&S West
Disaggregation of Revenue
Sales to external customers									461.7	455.5	400.6
Operating Segments | D&S West | Point in time
Disaggregation of Revenue
Sales to external customers									415.1	405.3
Operating Segments | D&S West | Over time
Disaggregation of Revenue
Sales to external customers									46.6	50.2
Operating Segments | E&C Cryogenics
Disaggregation of Revenue
Sales to external customers									190.2	136.9	125.5
Operating Segments | E&C Cryogenics | Point in time
Disaggregation of Revenue
Sales to external customers									0.3	1.0
Operating Segments | E&C Cryogenics | Over time
Disaggregation of Revenue
Sales to external customers									189.9	135.9
Operating Segments | E&C FinFans
Disaggregation of Revenue
Sales to external customers									361.7	253.6	100.1
Operating Segments | E&C FinFans | Point in time
Disaggregation of Revenue
Sales to external customers									87.9	135.2
Operating Segments | E&C FinFans | Over time
Disaggregation of Revenue
Sales to external customers									273.8	118.4
Intersegment Eliminations
Disaggregation of Revenue
Sales to external customers									(7.9)	(8.0)	$ (15.6)
Intersegment Eliminations | Point in time
Disaggregation of Revenue
Sales to external customers									(6.8)	(6.2)
Intersegment Eliminations | Over time
Disaggregation of Revenue
Sales to external customers									$ (1.1)	$ (1.8)

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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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