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Revenue (Tables) | 6 Months Ended
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Jun. 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 June 30, 2021
| Cryo Tank Solutions |  | Heat Transfer Systems |  | Specialty Products |  | Repair, Service & Leasing |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 89.8 |  |  | $ | 5.2 |  |  | $ | 73.4 |  |  | $ | 37.8 |  |  | $ | (1.5) |  |  | $ | 204.7 |
Over time | 8.0 |  |  | 60.0 |  |  | 33.4 |  |  | 16.8 |  |  | (0.9) |  |  | 117.3 |
Total | $ | 97.8 |  |  | $ | 65.2 |  |  | $ | 106.8 |  |  | $ | 54.6 |  |  | $ | (2.4) |  |  | $ | 322.0 |
| Three Months Ended June 30, 2020
| Cryo Tank Solutions |  | Heat Transfer Systems |  | Specialty Products |  | Repair, Service & Leasing |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 94.4 |  |  | $ | 8.1 |  |  | $ | 32.6 |  |  | $ | 25.9 |  |  | $ | (0.7) |  |  | $ | 160.3 |
Over time | 10.9 |  |  | 89.2 |  |  | 16.0 |  |  | 14.2 |  |  | (1.1) |  |  | 129.2 |
Total | $ | 105.3 |  |  | $ | 97.3 |  |  | $ | 48.6 |  |  | $ | 40.1 |  |  | $ | (1.8) |  |  | $ | 289.5 |
| Six Months Ended June 30, 2021
| Cryo Tank Solutions |  | Heat Transfer Systems |  | Specialty Products |  | Repair, Service & Leasing |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 188.5 |  |  | $ | 10.8 |  |  | $ | 135.3 |  |  | $ | 64.5 |  |  | $ | (4.4) |  |  | $ | 394.7 |
Over time | 13.2 |  |  | 123.6 |  |  | 48.8 |  |  | 31.5 |  |  | (1.3) |  |  | 215.8 |
Total | $ | 201.7 |  |  | $ | 134.4 |  |  | $ | 184.1 |  |  | $ | 96.0 |  |  | $ | (5.7) |  |  | $ | 610.5 |
| Six Months Ended June 30, 2020
| Cryo Tank Solutions |  | Heat Transfer Systems |  | Specialty Products |  | Repair, Service & Leasing |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 184.2 |  |  | $ | 15.2 |  |  | $ | 71.4 |  |  | $ | 53.9 |  |  | $ | (2.2) |  |  | $ | 322.5 |
Over time | 19.1 |  |  | 195.0 |  |  | 30.1 |  |  | 26.9 |  |  | (2.2) |  |  | 268.9 |
Total | $ | 203.3 |  |  | $ | 210.2 |  |  | $ | 101.5 |  |  | $ | 80.8 |  |  | $ | (4.4) |  |  | $ | 591.4 |
Changes in contract assets and contract liabilities balances | The following table represents changes in our contract assets and contract liabilities balances:
| June 30, 2021 |  | December 31, 2020 |  | Year-to-date Change ($) |  | Year-to-date Change (%)
Contract assets |  |  |  |  |  |  |
Accounts receivable, net of allowances | $ | 220.0 |  |  | $ | 200.8 |  |  | $ | 19.2 |  |  | 9.6 | %
Unbilled contract revenue | 68.2 |  |  | 79.4 |  |  | (11.2) |  |  | (14.1) | %
Contract liabilities |  |  |  |  |  |  |
Customer advances and billings in excess of contract revenue | $ | 126.1 |  |  | $ | 118.9 |  |  | $ | 7.2 |  |  | 6.1 | %
Long-term deferred revenue | 1.0 |  |  | 1.9 |  |  | (0.9) |  |  | (47.4) | %

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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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