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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2019
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue by Timing | The following table represents a disaggregation of revenue by timing of revenue along with the reportable segment for each category:
| Three Months Ended June 30, 2019
| Energy & Chemicals |  | D&S West |  | D&S East |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 76.1 |  |  | $ | 105.7 |  |  | $ | 75.0 |  |  | $ | (4.0 | ) |  | $ | 252.8 |
Over time | 44.1 |  |  | 10.0 |  |  | 2.7 |  |  | — |  |  | 56.8 |
Total | $ | 120.2 |  |  | $ | 115.7 |  |  | $ | 77.7 |  |  | $ | (4.0 | ) |  | $ | 309.6 |
| Three Months Ended June 30, 2018
| Energy & Chemicals |  | D&S West |  | D&S East |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 23.7 |  |  | $ | 105.2 |  |  | $ | 51.5 |  |  | $ | (1.6 | ) |  | $ | 178.8 |
Over time | 77.1 |  |  | 12.4 |  |  | 10.9 |  |  | (1.3 | ) |  | 99.1 |
Total | $ | 100.8 |  |  | $ | 117.6 |  |  | $ | 62.4 |  |  | $ | (2.9 | ) |  | $ | 277.9 |
| Six Months Ended June 30, 2019
| Energy & Chemicals |  | D&S West |  | D&S East |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 150.2 |  |  | $ | 213.1 |  |  | $ | 138.9 |  |  | $ | (7.0 | ) |  | $ | 495.2 |
Over time | 75.6 |  |  | 20.6 |  |  | 7.5 |  |  | — |  |  | 103.7 |
Total | $ | 225.8 |  |  | $ | 233.7 |  |  | $ | 146.4 |  |  | $ | (7.0 | ) |  | $ | 598.9 |
| Six Months Ended June 30, 2018
| Energy & Chemicals |  | D&S West |  | D&S East |  | Intersegment Eliminations |  | Consolidated
Point in time | $ | 47.6 |  |  | $ | 196.5 |  |  | $ | 102.0 |  |  | $ | (3.1 | ) |  | $ | 343.0 |
Over time | 143.1 |  |  | 21.7 |  |  | 15.5 |  |  | (1.3 | ) |  | 179.0 |
Total | $ | 190.7 |  |  | $ | 218.2 |  |  | $ | 117.5 |  |  | $ | (4.4 | ) |  | $ | 522.0 |
Changes in Contract Assets and Contract Liabilities Balances | The following table represents changes in our contract assets and contract liabilities balances:
| June 30, 2019 |  | December 31, 2018 |  | Year-to-date Change ($) |  | Year-to-date Change (%)
Contract assets |  |  |  |  |  |  |
Accounts receivable, net of allowances | $ | 204.4 |  |  | $ | 194.8 |  |  | $ | 9.6 |  |  | 4.9 | %
Unbilled contract revenue | 70.6 |  |  | 54.5 |  |  | 16.1 |  |  | 29.5 | %
Contract liabilities |  |  |  |  |  |  |
Customer advances and billings in excess of contract revenue | $ | 128.3 |  |  | $ | 130.0 |  |  | $ | (1.7 | ) |  | (1.3 | )%
Long-term deferred revenue | 0.6 |  |  | 1.4 |  |  | (0.8 | ) |  | (57.1 | )%

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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