Restructuring Activities - Rollforward (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Restructuring Reserve
Beginning balance, restructuring accrual	$ 0.2	$ 1.9	$ 0.8	$ 0.9	$ 0.9
Restructuring charges	1.9	1.9	2.9	12.7
Cash payments and other	(0.2)	(2.2)	(1.8)	(12.0)
Ending balance, restructuring accrual	1.9	1.6	1.9	1.6	0.8
Operating Segments \| Cryo Tank Solutions
Restructuring Reserve
Beginning balance, restructuring accrual	0.3	1.4	0.5	0.5	0.5
Restructuring charges	0.0	0.3	0.3	3.2
Cash payments and other	0.0	(0.6)	(0.5)	(2.6)
Ending balance, restructuring accrual	0.3	1.1	0.3	1.1	0.5
Operating Segments \| Heat Transfer Systems
Restructuring Reserve
Beginning balance, restructuring accrual	(0.1)	0.2	0.2	0.2	0.2
Restructuring charges	0.5	1.1	1.2	6.8
Cash payments and other	(0.3)	(1.1)	(1.3)	(6.8)
Ending balance, restructuring accrual	0.1	0.2	0.1	0.2	0.2
Operating Segments \| Specialty Products
Restructuring Reserve
Beginning balance, restructuring accrual	0.0	0.0	0.0	0.0	0.0
Restructuring charges	0.0	0.0	0.0	0.0
Cash payments and other	0.0	0.0	0.0	0.0
Ending balance, restructuring accrual	0.0	0.0	0.0	0.0	0.0
Operating Segments \| Repair, Service & Leasing
Restructuring Reserve
Beginning balance, restructuring accrual	0.0	0.0	0.0	0.0	0.0
Restructuring charges	1.4	0.1	1.4	0.1
Cash payments and other	0.1	(0.1)	0.1	(0.1)
Ending balance, restructuring accrual	1.5	0.0	1.5	0.0	0.0
Corporate
Restructuring Reserve
Beginning balance, restructuring accrual	0.0	0.3	0.1	0.2	0.2
Restructuring charges	0.0	0.4	0.0	2.6
Cash payments and other	0.0	(0.4)	(0.1)	(2.5)
Ending balance, restructuring accrual	$ 0.0	$ 0.3	$ 0.0	$ 0.3	$ 0.1

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3367-108585

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 45
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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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-Section S99
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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