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Revenue (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 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 $ 9.0 $ 3.1 $ 15.6 $ 108.3
Civil        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Remaining performance obligations revenue amount 4,400.0 4,600.0 $ 4,400.0 4,600.0
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 2,200.0 2,400.0 $ 2,200.0 2,400.0
Specialty Contractors        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Remaining performance obligations revenue amount $ 1,100.0 $ 1,200.0 $ 1,100.0 $ 1,200.0