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Revenue | 6 Months Ended
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Jun. 30, 2021
Revenue from Contract with Customer [Abstract] |
Revenue | 4. Revenue Revenue from contracts with customers consist of the following (in millions):
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Revenue |  |  |  |  |  |  |  |
Infrastructure |  | $ | 232.0 |  |  | $ | 172.3 |  |  | $ | 393.3 |  |  | $ | 348.8 |
Spectrum |  | 10.6 |  |  | 9.5 |  |  | 21.1 |  |  | 19.6 |
Life Sciences |  | 1.2 |  |  | — |  |  | 1.2 |  |  | — |
Total revenue |  | $ | 243.8 |  |  | $ | 181.8 |  |  | $ | 415.6 |  |  | $ | 368.4 |
Accounts receivables, net from contracts with customers consist of the following (in millions):
|  | June 30, 2021 |  | December 31, 2020
Accounts receivables with customers |  |  |  |
Infrastructure |  | $ | 343.7 |  |  | $ | 168.5 |
Spectrum |  | 8.5 |  |  | 7.3 |
Life Sciences |  | 0.1 |  |  | — |
Total accounts receivables with customers |  | $ | 352.3 |  |  | $ | 175.8 |
Infrastructure Segment The following table disaggregates DBMG's revenue by market (in millions):
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Commercial |  | $ | 84.8 |  |  | $ | 54.0 |  |  | $ | 134.3 |  |  | $ | 116.8 |
Industrial |  | 79.0 |  |  | 59.6 |  |  | 119.2 |  |  | 118.4 |
Transportation |  | 10.8 |  |  | 23.5 |  |  | 24.7 |  |  | 39.9 |
Government |  | 17.2 |  |  | 11.1 |  |  | 38.5 |  |  | 19.7 |
Leisure |  | 4.7 |  |  | 11.3 |  |  | 12.2 |  |  | 27.3 |
Healthcare |  | 11.1 |  |  | 4.7 |  |  | 20.0 |  |  | 12.6 |
Convention |  | 18.8 |  |  | 1.4 |  |  | 28.2 |  |  | 3.8 |
Other |  | 5.6 |  |  | 6.1 |  |  | 16.2 |  |  | 9.7 |
Total revenue from contracts with customers |  | 232.0 |  |  | 171.7 |  |  | 393.3 |  |  | 348.2 |
Other revenue |  | — |  |  | 0.6 |  |  | — |  |  | 0.6 |
Total Infrastructure segment revenue |  | $ | 232.0 |  |  | $ | 172.3 |  |  | $ | 393.3 |  |  | $ | 348.8 |
Contract assets and contract liabilities consisted of the following (in millions):
|  | June 30, 2021 |  | December 31, 2020
Costs and recognized earnings in excess of billings on uncompleted contracts |  | $ | 63.7 |  |  | $ | 55.6 |
Billings in excess of costs and recognized earnings on uncompleted contracts |  | $ | (146.8) |  |  | $ | (52.2) |
The change in contract assets is a result of the recording of $35.6 million of costs in excess of billings on uncompleted contracts driven by new commercial projects and $1.9 million of costs in excess of billings on uncompleted contracts for projects acquired in the Banker Steel acquisition, offset by $29.4 million of costs in excess of billings on uncompleted contracts transferred to receivables from contract assets recognized at the beginning of the period. The change in contract liabilities is a result of periodic billing in excess of costs on uncompleted contracts of $114.4 million driven largely by new commercial projects and $55.0 million of billings in excess of costs on uncompleted contracts for projects acquired as a result of the Banker Steel acquisition, offset by revenue recognized that was included in the contract liability balance at the beginning of the period in the amount of $74.8 million. The transaction price allocated to remaining unsatisfied performance obligations consisted of the following (in millions):
|  | Within one year |  | Within five years |  |  |  | Total
Commercial |  | $ | 580.5 |  |  | $ | 620.2 |  |  |  |  | $ | 1,200.7 |
Industrial |  | 201.3 |  |  | — |  |  |  |  | 201.3 |
Transportation |  | 41.5 |  |  | 17.2 |  |  |  |  | 58.7 |
Government |  | 47.3 |  |  | — |  |  |  |  | 47.3 |
Leisure |  | 7.0 |  |  | — |  |  |  |  | 7.0 |
Healthcare |  | 51.1 |  |  | — |  |  |  |  | 51.1 |
Convention |  | 52.7 |  |  | — |  |  |  |  | 52.7 |
Other |  | 5.6 |  |  | — |  |  |  |  | 5.6 |
Remaining unsatisfied performance obligations | $ | 987.0 |  |  | $ | 637.4 |  |  |  |  | $ | 1,624.4 |
DBMG includes an additional $10.0 million in its backlog that is not included in the remaining unsatisfied performance obligations noted above. This backlog represents commitments under master service agreements that are estimated amounts of work to be performed based on customer communications, historic experience and knowledge of our customers' intentions. Life Sciences Segment The following table disaggregates the Life Sciences segment's revenue by type (in millions):
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Systems revenue |  | $ | 1.2 |  |  | $ | — |  |  | $ | 1.2 |  |  | $ | — |
Total Life Sciences segment revenue |  | $ | 1.2 |  |  | $ | — |  |  | $ | 1.2 |  |  | $ | — |
Spectrum Segment The following table disaggregates the Spectrum segment's revenue by type (in millions):
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Network advertising |  | $ | 4.8 |  |  | $ | 4.0 |  |  | $ | 9.5 |  |  | $ | 9.0 |
Broadcast station |  | 4.5 |  |  | 3.8 |  |  | 8.9 |  |  | 7.3 |
Network distribution |  | 0.7 |  |  | 1.0 |  |  | 1.6 |  |  | 2.1 |
Other |  | 0.6 |  |  | 0.7 |  |  | 1.1 |  |  | 1.2 |
Total Spectrum segment revenue |  | $ | 10.6 |  |  | $ | 9.5 |  |  | $ | 21.1 |  |  | $ | 19.6 |
The transaction price allocated to remaining unsatisfied performance obligations consisted of $1.7 million, $6.9 million, and $0.1 million of network advertising, broadcasting station revenues, and other revenues, respectively, of which $5.6 million is expected to be recognized within one year and $3.1 million is expected to be recognized within five years.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 + Details
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