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Revenue (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Net revenue recognized related to performance obligations satisfies (or partially satisfied) in prior periods $ 163.5 $ 55.3 $ 180.4 $ 167.4
Civil        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Remaining performance obligations revenue amount 4,100.0 4,500.0 $ 4,100.0 4,500.0
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 3,200.0 2,300.0 $ 3,200.0 2,300.0
Specialty Contractors        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Remaining performance obligations revenue amount $ 1,300.0 $ 1,100.0 $ 1,300.0 $ 1,100.0