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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue
Sales to external customers	$ 310.4	$ 309.6	$ 631.5	$ 598.9
Point in time
Disaggregation of Revenue
Sales to external customers	179.8	196.8	359.8	384.1
Over time
Disaggregation of Revenue
Sales to external customers	130.6	112.8	271.7	214.8
Operating Segments | D&S East
Disaggregation of Revenue
Sales to external customers	79.7	77.7	149.7	146.4
Operating Segments | D&S East | Point in time
Disaggregation of Revenue
Sales to external customers	69.0	75.0	128.1	138.9
Operating Segments | D&S East | Over time
Disaggregation of Revenue
Sales to external customers	10.7	2.7	21.6	7.5
Operating Segments | D&S West
Disaggregation of Revenue
Sales to external customers	106.8	115.7	218.4	233.7
Operating Segments | D&S West | Point in time
Disaggregation of Revenue
Sales to external customers	91.3	105.7	193.7	213.1
Operating Segments | D&S West | Over time
Disaggregation of Revenue
Sales to external customers	15.5	10.0	24.7	20.6
Operating Segments | E&C Cryogenics
Disaggregation of Revenue
Sales to external customers	63.7	47.6	125.9	82.7
Operating Segments | E&C Cryogenics | Point in time
Disaggregation of Revenue
Sales to external customers	0.0	0.1	0.0	0.3
Operating Segments | E&C Cryogenics | Over time
Disaggregation of Revenue
Sales to external customers	63.7	47.5	125.9	82.4
Operating Segments | E&C FinFans
Disaggregation of Revenue
Sales to external customers	64.1	72.6	144.8	143.1
Operating Segments | E&C FinFans | Point in time
Disaggregation of Revenue
Sales to external customers	20.9	20.0	42.1	38.8
Operating Segments | E&C FinFans | Over time
Disaggregation of Revenue
Sales to external customers	43.2	52.6	102.7	104.3
Intersegment Eliminations
Disaggregation of Revenue
Sales to external customers	(3.9)	(4.0)	(7.3)	(7.0)
Intersegment Eliminations | Point in time
Disaggregation of Revenue
Sales to external customers	(1.4)	(4.0)	(4.1)	(7.0)
Intersegment Eliminations | Over time
Disaggregation of Revenue
Sales to external customers	$ (2.5)	$ 0.0	$ (3.2)	$ 0.0

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