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Accounts Receivable, Net of Allowance | 12 Months Ended
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Dec. 31, 2013
Receivables [Abstract] |
Accounts Receivable, Net of Allowance | Accounts Receivable, Net of Allowance The following table provides details of accounts receivable, net of allowance, for our continuing operations as of the dates indicated (in millions):
| December 31,
| 2013 |  | 2012
Contract billings | $ | 606.5 |  |  | $ | 522.0 |
Retainage | 159.3 |  |  | 113.5 |
Costs and earnings in excess of billings | 384.6 |  |  | 253.0 |
Accounts receivable, gross | $ | 1,150.4 |  |  | $ | 888.5 |
Less allowance for doubtful accounts | (16.1 | ) |  | (11.3 | )
Accounts receivable, net | $ | 1,134.3 |  |  | $ | 877.2 |
Retainage, which has been billed, but is not due until completion of performance and acceptance by customers, is generally expected to be collected within one year. Receivables expected to be collected beyond one year are recorded in other long-term assets. The Company maintains an allowance for doubtful accounts for estimated losses, both for specific customers and as a reserve against other balances, resulting from the inability of customers to make required payments. Amounts charged against the allowance primarily represent the write-off of accounts which had been fully reserved previously. Activity in the allowance for doubtful accounts for our continuing operations business for the periods indicated is as follows (in millions):
| Years Ended December 31,
| 2013 |  | 2012
Allowance for doubtful accounts at beginning of year | $ | 11.3 |  |  | $ | 7.7 |
Provision for doubtful accounts | 6.1 |  |  | 6.9 |
Amounts charged against the allowance | (1.3 | ) |  | (3.3 | )
Allowance for doubtful accounts at end of year | $ | 16.1 |  |  | $ | 11.3 |

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5066-111524 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Article 4 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5162-111524 + Details
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