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Revenue and Contracts in Process - Schedule of Infrastructure Segment Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Total Infrastructure segment revenue	$ 347.1	$ 242.2	$ 863.3	$ 870.5
Infrastructure
Disaggregation of Revenue [Line Items]
Revenue	338.2	232.8	835.3	844.3
Other revenue	0.2	0.0	1.1	1.6
Total Infrastructure segment revenue	338.4	232.8	836.4	845.9
Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue	116.1	57.1	246.2	230.9
Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue	85.1	64.7	219.1	242.5
Infrastructure | Transportation
Disaggregation of Revenue [Line Items]
Revenue	48.6	58.2	134.6	228.0
Infrastructure | Healthcare
Disaggregation of Revenue [Line Items]
Revenue	48.6	40.9	124.2	114.4
Infrastructure | Government
Disaggregation of Revenue [Line Items]
Revenue	36.1	3.9	84.5	5.6
Infrastructure | Leisure
Disaggregation of Revenue [Line Items]
Revenue	1.7	4.3	12.9	6.9
Infrastructure | Convention
Disaggregation of Revenue [Line Items]
Revenue	0.2	1.8	8.3	10.3
Infrastructure | Energy
Disaggregation of Revenue [Line Items]
Revenue	$ 1.8	$ 1.9	$ 5.5	$ 5.7

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