Segment and Geographic Information - Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Oct. 01, 2020	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets
Assets	$ 2,570.5			$ 2,481.4
Goodwill	865.9	$ 817.6	$ 817.6	811.4	$ 487.2
Identifiable intangible assets, net	493.1			522.4
Discontinued Operations
Revenues from External Customers and Long-Lived Assets
Assets	0.0			68.6
Cryo Tank Solutions
Revenues from External Customers and Long-Lived Assets
Goodwill	93.2	86.5	0.0	0.0
Heat Transfer Systems
Revenues from External Customers and Long-Lived Assets
Goodwill	435.2	432.6	0.0	0.0
Specialty Products
Revenues from External Customers and Long-Lived Assets
Goodwill	172.4	133.8	0.0	0.0
Repair, Service & Leasing
Revenues from External Customers and Long-Lived Assets
Goodwill	165.1	$ 164.7	$ 0.0	0.0
Operating Segments
Revenues from External Customers and Long-Lived Assets
Assets	967.3			919.6
Operating Segments | Cryo Tank Solutions
Revenues from External Customers and Long-Lived Assets
Assets	399.2			374.4
Operating Segments | Heat Transfer Systems
Revenues from External Customers and Long-Lived Assets
Assets	247.2			328.9
Operating Segments | Specialty Products
Revenues from External Customers and Long-Lived Assets
Assets	178.3			109.7
Operating Segments | Repair, Service & Leasing
Revenues from External Customers and Long-Lived Assets
Assets	142.6			106.6
Corporate
Revenues from External Customers and Long-Lived Assets
Assets	$ 244.2			$ 159.4