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Revenue Recognition and Related Balance Sheet Accounts - Additional Information (Details) $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2023 USD ($) customer | Jun. 30, 2022 USD ($) customer | Jun. 30, 2023 USD ($) customer | Jun. 30, 2022 USD ($) customer
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Percent of total revenues recognized associated with revenue recognition method |  |  | 54.00% | 51.70% | 52.40% | 51.50%
Revenues recognized related to change orders and claims | $ 745.1 | $ 549.3 | $ 745.1 |  | $ 745.1 |
Change in contract estimates, favorable (unfavorable) impact on revenue, percent |  |  | 0.70% | 1.50% | 0.30% | 1.00%
Change in contract estimates, (favorable) unfavorable impact on operating results, percent |  |  |  | (10.00%) | (5.00%) | (6.20%)
Change in contract estimates, (favorable) unfavorable impact on operating results, amount |  |  |  | $ (62.3) | $ 20.7 | $ (72.7)
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period |  |  |  |  | 897.8 |
Current retainage balances | 483.9 | 397.6 | $ 483.9 |  | 483.9 |
Non-current retainage balances | 147.8 | 136.2 | 147.8 |  | 147.8 |
Unbilled receivables | 929.4 | 823.9 | 929.4 |  | 929.4 |
Unearned revenues, current portion | $ 61.6 | $ 59.6 | $ 61.6 |  | $ 61.6 |
Canada Transmission Project |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results, amount |  |  |  | $ 13.0 |  | $ 23.7
Projects In Progress |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results, percent |  |  | 5.00% |  |  |
Customer Concentration Risk |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Number of customers representing ten percent or more of revenues | customer |  |  | 0 | 0 | 0 | 0
Customer Concentration Risk | One Customer | Accounts Receivable | Renewable Energy Infrastructure Solutions |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Concentration risk percentage (in percent) | 15.00% | 13.00% |  |  |  |

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