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Related Party Transactions (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
project
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Nov. 04, 2022
USD ($)
Related Party Transactions        
Acquisition of property, market value       $ 4.1
Mass-Transit Project in Los Angeles California        
Related Party Transactions        
Ownership percentage in joint venture 75.00%      
Mass-Transit Project in Los Angeles California | O&G        
Related Party Transactions        
Ownership percentage in joint venture 25.00%      
Related Party        
Related Party Transactions        
Related party, payment for leases $ 3.9 $ 3.8 $ 3.6  
Expenses incurred with related party 4.1 4.1 4.6  
Related Party | Alliant        
Related Party Transactions        
Insurance expense 15.3 11.4 $ 16.4  
Other liabilities $ 0.3 $ 1.6    
Related Party | Infrastructure Project in Los Angeles California | O&G        
Related Party Transactions        
Number of construction projects | project 2      
Related Party | Mass-Transit Project in Los Angeles California | O&G        
Related Party Transactions        
Number of construction projects | project 2