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Business, Basis of Presentation and Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Revenue [Line Items] |  |  |  |  |
Revenue recognition, performance obligations satisfied in previous periods, revenue recognized (in dollars) | $ 5.2 | $ 8.8 | $ 36.9 | $ 11.5 |
Revenue recognition, remaining performance obligations, contract price allocated (in dollars) | 4,200.0 |  | 4,200.0 |  |
Contract with customer, unapproved change orders and/or claims, amount (in dollars) | 97.0 |  | 97.0 |  | $ 51.0
Mobilization Costs |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Mobilization costs | $ 1.8 |  | $ 1.8 |  | $ 5.5
Maximum |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue recognition, changes In contract estimates, cost-to-cost method, financial effect, percentage |  |  | 5.00% | 5.00% |
Change order or claim approval process, term within which expected to be completed (in years) |  |  | 1 year |  |
Revenue Benchmark | Concentration Risk from Type of Arrangement | Master Service and Other Service Agreements |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Concentration risk, percentage of total | 37.00% | 32.00% | 35.00% | 36.00% |
Revenue Benchmark | Concentration Risk from Type of Arrangement | Master Service and Other Service Agreements | Point in Time |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Concentration risk, percentage of total | 4.00% | 4.00% | 4.00% | 5.00% |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01 |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 3 months |  | 3 months |  |
Revenue recognition, remaining performance obligations, contract price allocated (in dollars) | $ 1,300.0 |  | $ 1,300.0 |  |

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- 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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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054 + Details
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