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Revenue and Contracts in Process - Schedule of Infrastructure Segment Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Total Infrastructure segment revenue	$ 242.0	$ 313.1	$ 516.2	$ 628.3
Infrastructure
Disaggregation of Revenue [Line Items]
Revenue	232.8	304.0	497.1	611.5
Other revenue	0.3	1.2	0.9	1.6
Total Infrastructure segment revenue	233.1	305.2	498.0	613.1
Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue	59.4	93.6	134.4	177.7
Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue	75.9	96.5	129.2	173.8
Infrastructure | Transportation
Disaggregation of Revenue [Line Items]
Revenue	41.2	69.4	85.9	169.8
Infrastructure | Healthcare
Disaggregation of Revenue [Line Items]
Revenue	24.1	39.2	76.2	73.5
Infrastructure | Government
Disaggregation of Revenue [Line Items]
Revenue	23.6	(1.0)	48.4	1.7
Infrastructure | Leisure
Disaggregation of Revenue [Line Items]
Revenue	4.5	1.7	11.2	2.7
Infrastructure | Convention
Disaggregation of Revenue [Line Items]
Revenue	2.3	3.0	8.2	8.5
Infrastructure | Energy
Disaggregation of Revenue [Line Items]
Revenue	$ 1.8	$ 1.6	$ 3.6	$ 3.8

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