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Accounts Receivable, net (Tables) | 6 Months Ended
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Jun. 30, 2021
Receivables [Abstract] |
Schedule of Accounts Receivable | 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 |
Accounts receivable, net consist of the following (in millions):
|  | June 30, 2021 |  | December 31, 2020
Contracts in progress |  | $ | 250.5 |  |  | $ | 118.6 |
Unbilled retentions |  | 93.8 |  |  | 50.3 |
Trade receivables |  | 8.6 |  |  | 7.5 |
Other receivables |  | 12.2 |  |  | 8.9 |
Allowance for doubtful accounts |  | (0.5) |  |  | (0.6) |
Total |  | $ | 364.6 |  |  | $ | 184.7 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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