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Related Party Transactions (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
project
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Nov. 04, 2022
USD ($)
Related Party Transactions        
Acquisition of property, market value       $ 4.1
AirTrain Newark Replacement Program and Mass-Transit in Los Angeles, California        
Related Party Transactions        
Ownership percentage in joint venture 75.00%      
AirTrain Newark Replacement Program and Mass-Transit in Los Angeles, California | O&G        
Related Party Transactions        
Ownership percentage in joint venture 25.00%      
Bridge Replacement Project in Connecticut        
Related Party Transactions        
Ownership percentage in joint venture 30.00%      
Bridge Replacement Project in Connecticut | O&G        
Related Party Transactions        
Ownership percentage in joint venture 70.00%      
Related Party        
Related Party Transactions        
Related party, payment for leases $ 4.0 $ 3.9 $ 3.8  
Expenses incurred with related party 2.4 4.1 4.6  
Related Party | Alliant        
Related Party Transactions        
Insurance expense 14.9 15.3 $ 11.4  
Other liabilities $ 6.0 $ 0.3    
Related Party | Mass-Transit Project in Los Angeles California | O&G        
Related Party Transactions        
Number of construction projects | project 2      
Related Party | Infrastructure Projects in Northeastern United States | O&G        
Related Party Transactions        
Number of construction projects | project 2