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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue
Sales to external customers	$ 273.2	$ 338.0	$ 864.7	$ 894.1
Point in time
Disaggregation of Revenue
Sales to external customers	173.2	170.8	493.0	512.1
Over time
Disaggregation of Revenue
Sales to external customers	100.0	167.2	371.7	382.0
Operating Segments | D&S East
Disaggregation of Revenue
Sales to external customers	85.1	70.4	234.8	216.8
Operating Segments | D&S East | Point in time
Disaggregation of Revenue
Sales to external customers	77.7	64.1	205.8	203.0
Operating Segments | D&S East | Over time
Disaggregation of Revenue
Sales to external customers	7.4	6.3	29.0	13.8
Operating Segments | D&S West
Disaggregation of Revenue
Sales to external customers	91.1	93.3	269.5	280.0
Operating Segments | D&S West | Point in time
Disaggregation of Revenue
Sales to external customers	81.0	79.6	234.7	245.7
Operating Segments | D&S West | Over time
Disaggregation of Revenue
Sales to external customers	10.1	13.7	34.8	34.3
Operating Segments | E&C Cryogenics
Disaggregation of Revenue
Sales to external customers	64.8	48.9	190.7	131.3
Operating Segments | E&C Cryogenics | Point in time
Disaggregation of Revenue
Sales to external customers	4.2	10.8	4.2	10.8
Operating Segments | E&C Cryogenics | Over time
Disaggregation of Revenue
Sales to external customers	60.6	38.1	186.5	120.5
Operating Segments | E&C FinFans
Disaggregation of Revenue
Sales to external customers	40.5	128.6	185.3	272.0
Operating Segments | E&C FinFans | Point in time
Disaggregation of Revenue
Sales to external customers	17.2	19.5	59.3	58.6
Operating Segments | E&C FinFans | Over time
Disaggregation of Revenue
Sales to external customers	23.3	109.1	126.0	213.4
Intersegment Eliminations
Disaggregation of Revenue
Sales to external customers	(8.3)	(3.2)	(15.6)	(6.0)
Intersegment Eliminations | Point in time
Disaggregation of Revenue
Sales to external customers	(6.9)	(3.2)	(11.0)	(6.0)
Intersegment Eliminations | Over time
Disaggregation of Revenue
Sales to external customers	$ (1.4)	$ 0.0	$ (4.6)	$ 0.0

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