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Revenue (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Net revenue recognized related to performance obligations satisfied (or partially satisfied) in prior periods | $ (14.6) | $ (27.7) |
Civil [Member] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Amount | 5.5 | $ 5.5 | $ 4.3
Civil [Member] | Minimum [Member] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Range |  | 3 years |
Civil [Member] | Maximum [Member] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Range |  | 5 years |
Building [Member] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Amount | 1.7 | $ 1.7 | 2.0
Specialty Contractors [Member] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Amount | $ 2.2 | $ 2.2 | $ 1.6
Building And Specialty Contractors [Member] | Minimum [Member] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Range |  | 1 year |
Building And Specialty Contractors [Member] | Maximum [Member] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Range |  | 3 years |

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