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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% |  |  |  |  |

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