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Revenue (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Net revenue recognized related to performance obligations satisfies (or partially satisfied) in prior periods | $ (23.6) | $ (163.5) | $ (26.6) | $ (180.4)
Civil |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Remaining performance obligations revenue amount | 10,200.0 | 4,100.0 | $ 10,200.0 | 4,100.0
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 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 |
Building |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Remaining performance obligations revenue amount | 5,200.0 | 3,200.0 | $ 5,200.0 | 3,200.0
Specialty Contractors |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Remaining performance obligations revenue amount | $ 2,500.0 | $ 1,300.0 | $ 2,500.0 | $ 1,300.0

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