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Goodwill and Identifiable Assets (Tables)
 12 Months Ended
Dec. 31, 2024
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, 2022 (in millions). See Note 14. Segment Reporting for more information on the Company's reportable segments.
CommercialFederal GovernmentTotal
Balance as of December 31, 2022
$1,074.7 $817.2 $1,891.9 
Purchase price adjustment— 1.1 1.1 
Translation adjustment1.1 — 1.1 
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 
Schedule of Acquired Intangible Assets
Acquired intangible assets consisted of the following (in millions):
  December 31, 2024December 31, 2023
 Estimated Useful Life (in years)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Subject to amortization:     
Customer and contractual relationships
7 - 13
$405.3 $245.0 $160.3 $496.0 $282.0 $214.0 
Non-compete agreements
2 - 7
21.4 14.7 6.7 29.3 18.2 11.1 
  426.7 259.7 167.0 525.3 300.2 225.1 
Not subject to amortization:     
Trademarks272.8 — 272.8 272.8 — 272.8 
 $699.5 $259.7 $439.8 $798.1 $300.2 $497.9 
Schedule of Estimated Future Amortization Expense
Estimated future amortization expense is as follows (in millions):

2025$50.8 
202643.8 
202733.4 
202817.9 
202913.1 
Thereafter8.0 
$167.0