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Revenue Recognition and Related Balance Sheet Accounts - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
pool
Dec. 31, 2023
USD ($)
Jun. 30, 2024
USD ($)
customer
pool
Jun. 30, 2023
customer
Jun. 30, 2024
USD ($)
customer
pool
Jun. 30, 2023
USD ($)
customer
Disaggregation of Revenue [Line Items]            
Percent of total revenues recognized associated with revenue recognition method     58.20% 54.00% 58.00% 52.40%
Remaining performance obligation $ 14,370.0 $ 13,890.0 $ 14,370.0   $ 14,370.0  
Revenues recognized related to change orders and claims $ 662.3 778.9 $ 662.3   $ 662.3  
Change in contract estimates, favorable (unfavorable) impact on revenue, percent     0.40% 0.70% 0.20% 0.30%
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period         $ 1,240.0 $ 897.8
Number of risk pools used for calculation historical credit loss experience | pool 2   2   2  
Current retainage balances $ 646.0 610.0 $ 646.0   $ 646.0  
Non-current retainage balances 103.0 78.7 103.0   103.0  
Unbilled receivables 827.1 743.6 827.1   827.1  
Unearned revenues, current portion $ 70.5 $ 58.6 $ 70.5   $ 70.5  
Canada Transmission Project            
Disaggregation of Revenue [Line Items]            
Change in contract estimates, unfavorable impact on operating results, amount           $ 20.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01            
Disaggregation of Revenue [Line Items]            
Percent of remaining performance obligation expected to be recognized   66.90%        
Recognition period for remaining performance obligation   12 months        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01            
Disaggregation of Revenue [Line Items]            
Percent of remaining performance obligation expected to be recognized 65.80%   65.80%   65.80%  
Recognition period for remaining performance obligation 12 months   12 months   12 months  
Projects In Progress            
Disaggregation of Revenue [Line Items]            
Change in contract estimates, (favorable) unfavorable impact on operating results, percent     5.00% 5.00% 5.00% 5.00%
Projects In Process, Increased Costs | United States Solar Facility            
Disaggregation of Revenue [Line Items]            
Change in contract estimates, unfavorable impact on operating results, amount         $ 24.6  
Projects In Progress, Decreased Productivity | United States Solar Facility            
Disaggregation of Revenue [Line Items]            
Change in contract estimates, unfavorable impact on operating results, amount         $ 22.0  
Customer Concentration Risk            
Disaggregation of Revenue [Line Items]            
Number of customers representing ten percent or more of revenues | customer     0 0 0 0
Number of customers representing ten percent or more of accounts receivable | customer         0  
Customer Concentration Risk | One Customer | Accounts Receivable | Renewable Energy            
Disaggregation of Revenue [Line Items]            
Concentration risk percentage (in percent)   10.00%        
Credit Concentration Risk | Financial Instruments | Secondary Pool            
Disaggregation of Revenue [Line Items]            
Concentration risk percentage (in percent) 15.00%