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Revenue Recognition and Related Balance Sheet Accounts - Additional Information (Details) $ in Millions			3 Months Ended
	Mar. 31, 2024 USD ($) pool	Dec. 31, 2023 USD ($)	Mar. 31, 2024 USD ($) customer pool	Mar. 31, 2023 USD ($) customer
Disaggregation of Revenue [Line Items]
Percent of total revenues recognized associated with revenue recognition method			57.50%	50.10%
Remaining performance obligation	$ 14,880.0	$ 13,890.0	$ 14,880.0
Revenues recognized related to change orders and claims	$ 774.8	778.9	$ 774.8
Change in contract estimates, favorable (unfavorable) impact on revenue, percent			0.10%
Change in contract estimates, unfavorable impact on operating results, amount			$ 21.9
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period			$ 952.6	$ 641.1
Number of pools | pool	2		2
Current retainage balances	$ 624.2	610.0	$ 624.2
Non-current retainage balances	88.4	78.7	88.4
Unbilled receivables	794.3	743.6	794.3
Unearned revenues, current portion	$ 66.7	$ 58.6	$ 66.7
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]: 2024-04-01
Disaggregation of Revenue [Line Items]
Percent of remaining performance obligation expected to be recognized	64.60%		64.60%
Recognition period for remaining performance obligation	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%
Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Number of customers representing ten percent or more of revenues | customer			0	0
Customer Concentration Risk | One Customer | Accounts Receivable | Renewable Energy
Disaggregation of Revenue [Line Items]
Concentration risk percentage (in percent)	10.00%	10.00%
Credit Concentration Risk | Financial Instruments | Secondary Pool
Disaggregation of Revenue [Line Items]
Concentration risk percentage (in percent)	12.00%

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