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Goodwill and Identifiable Assets (Tables)
 9 Months Ended
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table summarizes the activity related to the carrying amount of goodwill by segment since December 31, 2020 (in millions).
CommercialFederal GovernmentTotal
Balance as of December 31, 2020
$778.6 $642.1 $1,420.7 
2021 acquisitions
51.1 94.8 145.9 
Purchase price adjustments— 3.3 3.3 
Translation adjustment(0.4)— (0.4)
Balance as of December 31, 2021
829.3 740.2 1,569.5 
2022 acquisition
246.9 — 246.9 
Purchase price adjustments0.4 (8.5)(8.1)
Translation adjustment(2.4)— (2.4)
Balance as of September 30, 2022
$1,074.2 $731.7 $1,805.9 
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Approximately $163.6 million and $127.2 million of the goodwill for the 2022 and 2021 acquisitions, respectively, is deductible for income tax purposes.
Schedule of Acquired Intangible Assets
Acquired identifiable intangible assets consisted of the following (in millions):
September 30, 2022December 31, 2021
Estimated Useful Life in YearsGross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer and contractual relationships
7 - 13
$555.9 $299.7 $256.2 $493.9 $260.2 $233.7 
Contractor relationships4— — — 45.5 45.5 — 
Contract Backlog
1 - 3
34.8 33.8 1.0 34.8 31.0 3.8 
Non-compete agreements
1 - 7
39.7 24.3 15.4 29.4 21.6 7.8 
630.4 357.8 272.6 603.6 358.3 245.3 
Not subject to amortization:
Trademarks272.8 — 272.8 242.6 — 242.6 
Total$903.2 $357.8 $545.4 $846.2 $358.3 $487.9 
Schedule of Estimated Future Amortization Expense
Estimated future amortization expense follows (in millions): 
Remainder of 2022$17.8 
202359.3 
202449.8 
202541.8 
202635.4 
Thereafter68.5 
$272.6