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Revenue (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Net revenue recognized related to performance obligations satisfies (or partially satisfied) in prior periods | $ 30.4 | $ 13.8 | $ 71.3 | $ 46.3
Civil |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Remaining performance obligations revenue amount | 5,100.0 | 5,300.0 | $ 5,100.0 | 5,300.0
Civil | Minimum |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Remaining performance obligations revenue period |  |  | 3 years |
Civil | Maximum |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Remaining performance obligations revenue period |  |  | 5 years |
Building |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Remaining performance obligations revenue amount | 1,900.0 | 1,600.0 | $ 1,900.0 | 1,600.0
Specialty Contractors |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Remaining performance obligations revenue amount | $ 1,900.0 | $ 2,200.0 | $ 1,900.0 | $ 2,200.0
Building And Specialty Contractors | Minimum |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Remaining performance obligations revenue period |  |  | 1 year |
Building And Specialty Contractors | Maximum |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Remaining performance obligations revenue period |  |  | 3 years |

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