Goodwill and Intangible Assets - Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Goodwill
Beginning Balance, Goodwill	$ 468.8
Foreign currency translation adjustments	(1.5)
Goodwill acquired during the year	4.7
Ending Balance, Goodwill	472.0
Beginning Balance, Accumulated goodwill impairment loss	195.8
Foreign currency translation adjustments	(0.1)
Ending Balance, Accumulated goodwill impairment loss	195.7
Energy & Chemicals
Goodwill
Beginning Balance, Goodwill	275.1
Foreign currency translation adjustments	(0.9)
Goodwill acquired during the year	0.0
Ending Balance, Goodwill	274.2
Beginning Balance, Accumulated goodwill impairment loss	64.6
Foreign currency translation adjustments	(0.1)
Ending Balance, Accumulated goodwill impairment loss	64.5
Distribution & Storage
Goodwill
Beginning Balance, Goodwill	169.2
Foreign currency translation adjustments	(0.6)
Goodwill acquired during the year	4.7
Ending Balance, Goodwill	173.3
Beginning Balance, Accumulated goodwill impairment loss	0.0
Foreign currency translation adjustments	0.0
Ending Balance, Accumulated goodwill impairment loss	0.0
BioMedical
Goodwill
Beginning Balance, Goodwill	24.5
Foreign currency translation adjustments	0.0
Goodwill acquired during the year	0.0
Ending Balance, Goodwill	24.5
Beginning Balance, Accumulated goodwill impairment loss	131.2
Foreign currency translation adjustments	0.0
Ending Balance, Accumulated goodwill impairment loss	$ 131.2