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Business, Basis of Presentation and Significant Accounting Policies (Revenue Recognition) (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue [Line Items] |  |  |
Revenue recognition, performance obligations satisfied in previous periods, revenue recognized (in dollars) | $ 13.5 | $ 58.3 | $ 38.5
Contract with customer, unapproved change orders and/or claims, amount (in dollars) | $ 51.0 | $ 27.0 |
Maximum [Member] |  |  |
Revenue [Line Items] |  |  |
Revenue recognition, changes in contract estimates, cost-to-cost method, financial effect, percentage | 5.00% | 5.00% | 5.00%
Change order or claim approval process, term within which expected to be completed (in years) | 1 year |  |
Revenue Benchmark [Member] | Concentration Risk from Type of Arrangement [Member] | Master Service and Other Service Agreements [Member] |  |  |
Revenue [Line Items] |  |  |
Concentration risk, percentage of total | 36.00% | 36.00% | 35.00%
Revenue Benchmark [Member] | Concentration Risk from Type of Arrangement [Member] | Master Service and Other Service Agreements [Member] | Point in Time [Member] |  |  |
Revenue [Line Items] |  |  |
Concentration risk, percentage of total | 5.00% | 5.00% | 7.00%
Mobilization Costs [Member] |  |  |
Revenue [Line Items] |  |  |
Capitalized mobilization costs, net | $ 5.5 |  |

X
- Definition Disclosure of the percentage effect on project profit (defined as project revenue less project costs of revenue, including depreciation) during the reporting period of changes in contract estimates for projects that were in process as of the end of the prior year and are accounted for under the cost-to-cost method. + References No definition available. + Details
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