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Accounts Receivable, Net of Allowance (Tables) | 12 Months Ended
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Dec. 31, 2013
Receivables [Abstract] |
Schedule of 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 |
Schedule of Activity in Allowance for Doubtful Accounts | 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 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://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 + Details
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- Definition Tabular disclosure of credit losses for current financing receivables (such as trade and accounts receivable), including a rollforward of the balance. An alternative caption includes allowance for doubtful accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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