Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Restructuring Activities - Narratives (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost and Reserve
Restructuring costs	$ 1.5		$ 2.0	$ 13.3	$ 3.5
Property, plant and equipment impairment and disposals				(5.6)
Operating Segments \| E&C Cryogenics
Restructuring Cost and Reserve
Restructuring costs	$ 0.2		$ 0.0	2.4	$ 0.4
Property, plant and equipment impairment and disposals		$ 1.6		$ (1.6)