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Revenue (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Net revenue recognized related to performance obligations satisfies (or partially satisfied) in prior periods $ 275.8 $ 214.2 $ 292.3
Civil      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Performance obligation amount $ 7,300.0 4,200.0  
Civil | Minimum      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Remaining performance obligation period range 3 years    
Civil | Maximum      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Remaining performance obligation period range 5 years    
Building      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Performance obligation amount $ 4,600.0 2,200.0  
Specialty Contractors      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Performance obligation amount $ 2,000.0 $ 1,100.0  
Building and Specialty Contractors | Minimum      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Remaining performance obligation period range 1 year    
Building and Specialty Contractors | Maximum      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Remaining performance obligation period range 3 years