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Goodwill and Identifiable Assets
12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Identifiable Intangible Assets
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 

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 

The Company removed gross and accumulated amortization balances related to intangible assets that are fully amortized as of December 31, 2024 and 2023.

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

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