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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2020
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:
| Year Ended December 31, 2020
| Cryo Tank Solutions |  | Heat Transfer Systems |  | Specialty Products |  | Repair, Service & Leasing |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 378.3 |  |  | $ | 28.6 |  |  | $ | 184.6 |  |  | $ | 110.3 |  |  | $ | (4.5) |  |  | $ | 697.3 |
Over time | 37.5 |  |  | 341.2 |  |  | 58.0 |  |  | 48.0 |  |  | (4.9) |  |  | 479.8 |
Total | $ | 415.8 |  |  | $ | 369.8 |  |  | $ | 242.6 |  |  | $ | 158.3 |  |  | $ | (9.4) |  |  | $ | 1,177.1 |
| Year Ended December 31, 2019
| Cryo Tank Solutions |  | Heat Transfer Systems |  | Specialty Products |  | Repair, Service & Leasing |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 385.2 |  |  | $ | 26.3 |  |  | $ | 161.2 |  |  | $ | 117.6 |  |  | $ | (5.2) |  |  | $ | 685.1 |
Over time | 24.7 |  |  | 415.4 |  |  | 46.7 |  |  | 45.0 |  |  | (1.4) |  |  | 530.4 |
Total | $ | 409.9 |  |  | $ | 441.7 |  |  | $ | 207.9 |  |  | $ | 162.6 |  |  | $ | (6.6) |  |  | $ | 1,215.5 |
| Year Ended December 31, 2018
| Cryo Tank Solutions |  | Heat Transfer Systems |  | Specialty Products |  | Repair, Service & Leasing |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 366.9 |  |  | $ | 60.3 |  |  | $ | 150.3 |  |  | $ | 102.5 |  |  | $ | (2.2) |  |  | $ | 677.8 |
Over time | 4.5 |  |  | 229.5 |  |  | 34.2 |  |  | 57.9 |  |  | — |  |  | 326.1 |
Total | $ | 371.4 |  |  | $ | 289.8 |  |  | $ | 184.5 |  |  | $ | 160.4 |  |  | $ | (2.2) |  |  | $ | 1,003.9 |
Changes in Contract Assets and Contract Liabilities Balances | The following table represents changes in our contract assets and contract liabilities balances:
| December 31, 2020 |  | December 31, 2019 |  | Year-to-date Change ($) |  | Year-to-date Change (%)
Contract assets |  |  |  |  |  |  |
Accounts receivable, net of allowances | $ | 200.8 |  |  | $ | 191.6 |  |  | $ | 9.2 |  |  | 4.8 | %
Unbilled contract revenue | 79.4 |  |  | 86.1 |  |  | (6.7) |  |  | (7.8) | %
Contract liabilities |  |  |  |  |  |  |
Customer advances and billings in excess of contract revenue | $ | 118.9 |  |  | $ | 127.7 |  |  | $ | (8.8) |  |  | (6.9) | %
Long-term deferred revenue | 1.9 |  |  | 0.8 |  |  | 1.1 |  |  | 137.5 | %

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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=121604090&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=121604090&loc=SL49130545-203045 + Details
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