Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Mar. 31, 2019	Sep. 30, 2019
Goodwill
Beginning Balance, Goodwill	$ 520.7	$ 520.7
Foreign currency translation adjustments		(6.8)
Goodwill from acquisitions		240.1
Goodwill purchase price adjustment		44.0
Ending Balance, Goodwill		798.0
Beginning Balance, Accumulated goodwill impairment loss	147.1	147.1
Ending Balance, Accumulated goodwill impairment loss		147.1
VRV
Goodwill
Beginning Balance, Goodwill	63.2	63.2
Goodwill purchase price adjustment		43.2
Ending Balance, Goodwill		106.4
Skaff
Goodwill
Goodwill purchase price adjustment	0.8	0.8
E&C
Goodwill
Beginning Balance, Goodwill	295.8	295.8
Reallocation		(295.8)
Ending Balance, Goodwill		0.0
Beginning Balance, Accumulated goodwill impairment loss	0.0	0.0
Ending Balance, Accumulated goodwill impairment loss		0.0
E&C Cryogenics
Goodwill
Beginning Balance, Goodwill	0.0	0.0
Reallocation		183.5
Foreign currency translation adjustments		(1.9)
Ending Balance, Goodwill		185.9
Beginning Balance, Accumulated goodwill impairment loss	40.9	40.9
Ending Balance, Accumulated goodwill impairment loss		40.9
E&C Cryogenics \| VRV
Goodwill
Goodwill purchase price adjustment		4.3
E&C FinFans
Goodwill
Beginning Balance, Goodwill	0.0	0.0
Reallocation		112.3
Foreign currency translation adjustments		(0.6)
Goodwill from acquisitions		240.1
Ending Balance, Goodwill		351.8
Beginning Balance, Accumulated goodwill impairment loss	23.7	23.7
Ending Balance, Accumulated goodwill impairment loss		23.7
D&S West
Goodwill
Beginning Balance, Goodwill	151.3	151.3
Goodwill purchase price adjustment		0.8
Ending Balance, Goodwill		152.1
Beginning Balance, Accumulated goodwill impairment loss	82.5	82.5
Ending Balance, Accumulated goodwill impairment loss		82.5
D&S East
Goodwill
Beginning Balance, Goodwill	73.6	73.6
Foreign currency translation adjustments		(4.3)
Goodwill purchase price adjustment		38.9
Ending Balance, Goodwill		108.2
Beginning Balance, Accumulated goodwill impairment loss	$ 0.0	0.0
Ending Balance, Accumulated goodwill impairment loss		$ 0.0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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