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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue by timing | The following tables represent a disaggregation of revenue by timing of revenue along with the reportable segment for each category:
| Three Months Ended September 30, 2021
| Cryo Tank Solutions |  | Heat Transfer Systems |  | Specialty Products |  | Repair, Service & Leasing |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 98.1 |  |  | $ | 4.6 |  |  | $ | 82.3 |  |  | $ | 29.2 |  |  | $ | (3.1) |  |  | $ | 211.1 |
Over time | 14.1 |  |  | 51.8 |  |  | 34.6 |  |  | 17.1 |  |  | (0.4) |  |  | 117.2 |
Total | $ | 112.2 |  |  | $ | 56.4 |  |  | $ | 116.9 |  |  | $ | 46.3 |  |  | $ | (3.5) |  |  | $ | 328.3 |
| Three Months Ended September 30, 2020
| Cryo Tank Solutions |  | Heat Transfer Systems |  | Specialty Products |  | Repair, Service & Leasing |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 99.3 |  |  | $ | 6.6 |  |  | $ | 43.5 |  |  | $ | 25.7 |  |  | $ | (1.9) |  |  | $ | 173.2 |
Over time | 2.7 |  |  | 74.1 |  |  | 12.5 |  |  | 10.8 |  |  | (0.1) |  |  | 100.0 |
Total | $ | 102.0 |  |  | $ | 80.7 |  |  | $ | 56.0 |  |  | $ | 36.5 |  |  | $ | (2.0) |  |  | $ | 273.2 |
| Nine Months Ended September 30, 2021
| Cryo Tank Solutions |  | Heat Transfer Systems |  | Specialty Products |  | Repair, Service & Leasing |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 286.6 |  |  | $ | 15.4 |  |  | $ | 217.6 |  |  | $ | 93.7 |  |  | $ | (7.5) |  |  | $ | 605.8 |
Over time | 27.3 |  |  | 175.4 |  |  | 83.4 |  |  | 48.6 |  |  | (1.7) |  |  | 333.0 |
Total | $ | 313.9 |  |  | $ | 190.8 |  |  | $ | 301.0 |  |  | $ | 142.3 |  |  | $ | (9.2) |  |  | $ | 938.8 |
| Nine Months Ended September 30, 2020
| Cryo Tank Solutions |  | Heat Transfer Systems |  | Specialty Products |  | Repair, Service & Leasing |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 280.7 |  |  | $ | 21.8 |  |  | $ | 114.9 |  |  | $ | 79.6 |  |  | $ | (4.0) |  |  | $ | 493.0 |
Over time | 24.6 |  |  | 269.1 |  |  | 42.6 |  |  | 37.7 |  |  | (2.3) |  |  | 371.7 |
Total | $ | 305.3 |  |  | $ | 290.9 |  |  | $ | 157.5 |  |  | $ | 117.3 |  |  | $ | (6.3) |  |  | $ | 864.7 |
Changes in contract assets and contract liabilities balances | The following table represents changes in our contract assets and contract liabilities balances:
| September 30, 2021 |  | December 31, 2020 |  | Year-to-date Change ($) |  | Year-to-date Change (%)
Contract assets |  |  |  |  |  |  |
Accounts receivable, net of allowances | $ | 237.1 |  |  | $ | 200.8 |  |  | $ | 36.3 |  |  | 18.1 | %
Unbilled contract revenue | 94.4 |  |  | 79.4 |  |  | 15.0 |  |  | 18.9 | %
Contract liabilities |  |  |  |  |  |  |
Customer advances and billings in excess of contract revenue | $ | 163.6 |  |  | $ | 118.9 |  |  | $ | 44.7 |  |  | 37.6 | %
Long-term deferred revenue | 0.1 |  |  | 1.9 |  |  | (1.8) |  |  | (94.7) | %

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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