Goodwill and Identifiable Assets (Tables)

12 Months Ended

Dec. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table summarizes the activity related to the carrying amount of goodwill by reportable segment since December 31, 2023 (in millions). See Note 15. Segment Reporting for more information on the Company's reportable segments.

	Commercial		Federal Government		Total
Balance as of December 31, 2023	$	1,075.8	$	818.3	$	1,894.1
Translation adjustment	(1.0)		—		(1.0)
Balance as of December 31, 2024	1,074.8		818.3		1,893.1
Acquisition of TopBloc	248.7		—		248.7
Translation adjustment	1.4		—		1.4
Balance as of December 31, 2025	$	1,324.9	$	818.3	$	2,143.2

Schedule of Acquired Intangible Assets

Acquired intangible assets consisted of the following (in millions):

		December 31, 2025						December 31, 2024
	Estimated Useful Life (in years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Subject to amortization:
Customer and contractual relationships	6 - 13	$	447.4	$	305.2	$	142.2	$	405.3	$	245.0	$	160.3
Non-compete agreements	3 - 7	21.4		18.2		3.2		21.4		14.7		6.7
Internally-developed software	3	4.4		1.2		3.2		—		—		—
		473.2		324.6		148.6		426.7		259.7		167.0
Not subject to amortization:
Trademarks		305.2		—		305.2		272.8		—		272.8
		$	778.4	$	324.6	$	453.8	$	699.5	$	259.7	$	439.8

Schedule of Estimated Future Amortization Expense

Estimated future amortization expense is as follows (in millions):

2026	$	54.5
2027	40.4
2028	23.1
2029	17.0
2030	11.0
Thereafter	2.6
	$	148.6