Reportable Segments - Segment Income (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
Jun. 11, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information
Sales to external customers		$ 309.6	$ 277.9	$ 598.9	$ 522.0
Depreciation and amortization expense		16.0	12.1	32.0	24.8
Operating income (income)		25.3	19.5	29.9	34.3
Capital expenditures		9.2	12.0	15.1	18.2
Restructuring costs		4.4	0.6	11.8	1.5
Severance costs		0.4	0.2	1.9	0.8
Share-based compensation expense adjustment		(1.9)	0.1	4.3	3.0
Employee severance
Segment Reporting Information
Share-based compensation expense adjustment			(1.8)		(1.8)
Employee severance \| CEO
Segment Reporting Information
Severance costs	$ 1.4
Terminiation benefits
Segment Reporting Information
Severance costs			3.2
Terminiation benefits \| CEO
Segment Reporting Information
Severance costs					3.2
Cryobiological storage
Segment Reporting Information
Sales to external customers		22.5	20.0	42.8	39.1
Product warranty expense			3.8		3.8
VRV
Segment Reporting Information
Sales of acquiree		28.9		51.0
Operating loss of acquiree		(1.1)		(9.2)
Inventory step up adjustment				1.7
Operating Segments \| Energy & Chemicals
Segment Reporting Information
Sales to external customers		120.2	100.8	225.8	190.7
Depreciation and amortization expense		8.7	6.5	17.3	13.1
Operating income (income)		10.2	5.9	8.9	8.7
Capital expenditures		0.8	6.1	4.0	8.1
Restructuring costs		(1.1)	0.2	3.4	0.4
Operating Segments \| Energy & Chemicals \| Cryobiological storage
Segment Reporting Information
Sales to external customers		0.0	0.0	0.0	0.0
Operating Segments \| Energy & Chemicals \| VRV
Segment Reporting Information
Sales of acquiree		12.9		21.5
Operating loss of acquiree		(2.8)		(5.6)
Operating Segments \| D&S West
Segment Reporting Information
Sales to external customers		115.7	117.6	233.7	218.2
Depreciation and amortization expense		2.9	2.7	5.8	5.6
Operating income (income)		28.7	23.6	54.3	45.8
Capital expenditures		2.6	2.1	3.8	3.2
Restructuring costs		0.1	0.0	0.4	0.0
Operating Segments \| D&S West \| Cryobiological storage
Segment Reporting Information
Sales to external customers		24.7	20.0	46.7	39.1
Product warranty expense			3.8		3.8
Operating Segments \| D&S East
Segment Reporting Information
Sales to external customers		77.7	62.4	146.4	117.5
Depreciation and amortization expense		4.0	2.5	8.2	5.4
Operating income (income)		1.9	6.5	(0.4)	10.2
Capital expenditures		4.9	2.0	5.9	3.9
Restructuring costs		5.4	0.3	7.8	0.5
Operating Segments \| D&S East \| Cryobiological storage
Segment Reporting Information
Sales to external customers		0.0	0.0	0.0	0.0
Operating Segments \| D&S East \| VRV
Segment Reporting Information
Sales of acquiree		16.0		29.5
Operating loss of acquiree		1.7		(3.6)
Intersegment Eliminations
Segment Reporting Information
Sales to external customers		(4.0)	(2.9)	(7.0)	(4.4)
Depreciation and amortization expense		0.0	0.0	0.0	0.0
Operating income (income)		(1.4)	(0.8)	(2.5)	(1.2)
Capital expenditures		0.0	0.0	0.0	0.0
Intersegment Eliminations \| Cryobiological storage
Segment Reporting Information
Sales to external customers		(2.2)	0.0	(3.9)	0.0
Corporate
Segment Reporting Information
Sales to external customers		0.0	0.0	0.0	0.0
Depreciation and amortization expense		0.4	0.4	0.7	0.7
Operating income (income)		(14.1)	(15.7)	(30.4)	(29.2)
Capital expenditures		0.9	1.8	1.4	3.0
Restructuring costs		0.0	0.1	0.2	0.6
Acquisition related costs		$ 1.8	$ 0.8	$ 2.7	$ 2.1

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