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Revenue (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Net revenue recognized related to performance obligations satisfies (or partially satisfied) in prior periods | $ 77.0 | $ 177.5 | $ 19.4
Alaskan Way Viaduct Matter |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Net revenue recognized related to performance obligations satisfies (or partially satisfied) in prior periods |  | 123.9 |
Civil |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligation amount | $ 4,800.0 | 5,200.0 |
Civil | Minimum |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Remaining performance obligation period range | 3 years |  |
Civil | Maximum |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Remaining performance obligation period range | 5 years |  |
Building |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligation amount | $ 1,500.0 | 2,200.0 |
Specialty Contractors |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligation amount | $ 1,800.0 | $ 2,200.0 |
Building And Specialty Contractors | Minimum |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Remaining performance obligation period range | 1 year |  |
Building And Specialty Contractors | Maximum |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Remaining performance obligation period range | 3 years |  |

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