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Segment Reporting - Disaggregated Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from External Customer [Line Items]
Revenues	$ 4,099.7	$ 4,450.6	$ 4,581.1
Federal Government Business
Revenue from External Customer [Line Items]
Revenues	1,231.0	1,276.2	1,145.4
Federal Government Business | FFP
Revenue from External Customer [Line Items]
Revenues	367.7	386.7	331.6
Federal Government Business | T&M
Revenue from External Customer [Line Items]
Revenues	522.0	504.9	456.3
Federal Government Business | Cost reimbursable
Revenue from External Customer [Line Items]
Revenues	$ 341.3	$ 384.6	$ 357.5

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