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Revenue and Contracts in Process - Schedule of Infrastructure Segment Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total Infrastructure segment revenue	$ 274.2	$ 315.2
Infrastructure
Disaggregation of Revenue [Line Items]
Revenue	264.3	307.5
Other revenue	0.6	0.4
Total Infrastructure segment revenue	264.9	307.9
Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue	74.6	84.1
Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue	53.8	77.3
Infrastructure | Healthcare
Disaggregation of Revenue [Line Items]
Revenue	52.0	34.3
Infrastructure | Transportation
Disaggregation of Revenue [Line Items]
Revenue	44.7	100.4
Infrastructure | Government
Disaggregation of Revenue [Line Items]
Revenue	24.8	2.7
Infrastructure | Leisure
Disaggregation of Revenue [Line Items]
Revenue	6.6	1.0
Infrastructure | Convention
Disaggregation of Revenue [Line Items]
Revenue	5.9	5.5
Infrastructure | Energy
Disaggregation of Revenue [Line Items]
Revenue	$ 1.9	$ 2.2

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