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Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Receivables [Abstract] |
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets | The following table provides details of accounts receivable, net of allowance, and contract assets (together “accounts receivable, net”) as of the dates indicated (in millions):
| December 31,
| 2020 |  | 2019
Contract billings | $ | 805.0 |  |  | $ | 860.4 |
Less allowance | (20.5) |  |  | (10.1) |
Accounts receivable, net of allowance | $ | 784.5 |  |  | $ | 850.3 |
Retainage | $ | 287.7 |  |  | $ | 345.2 |
Unbilled receivables | 682.0 |  |  | 679.4 |
Contract assets | $ | 969.7 |  |  | $ | 1,024.6 |

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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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