Goodwill and Identifiable Assets (Tables)

3 Months Ended

Mar. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Goodwill by reportable segment is as follows (in millions):

	Commercial		Federal Government		Total
Balance at March 31, 2024 and December 31, 2023	$	1,075.8	$	818.3	$	1,894.1

Schedule of Acquired Intangible Assets

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

		March 31, 2024						December 31, 2023
	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	7 - 13	$	496.0	$	296.0	$	200.0	$	496.0	$	282.0	$	214.0
Non-compete agreements	2 - 7	29.3		19.3		10.0		29.3		18.2		11.1
		525.3		315.3		210.0		525.3		300.2		225.1
Not subject to amortization:
Trademarks		272.8		—		272.8		272.8		—		272.8
		$	798.1	$	315.3	$	482.8	$	798.1	$	300.2	$	497.9

Schedule of Estimated Future Amortization Expense

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

Remainder of 2024	$	43.0
2025	48.8
2026	41.8
2027	32.0
2028	21.2
Thereafter	23.2
	$	210.0