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Acquisition
 6 Months Ended
Jun. 30, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]  
Acquisition Acquisition
On June 30, 2025, we completed the acquisition of the VeloCloud business ("VeloCloud") from Broadcom for total cash consideration of $300.0 million. VeloCloud's secure, AI-optimized cloud WAN portfolio provides seamless connectivity to customer sites of any type, complementing Arista's leading data center and campus wired/wireless portfolio. The preliminary purchase price allocation based on the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date, included $268.4 million of intangible assets, $148.0 million of goodwill and $116.4 million of net tangible liabilities assumed. The change in the carrying value of goodwill for the three months ended June 30, 2025 was solely related to the acquisition, and a portion of the goodwill is deductible for tax purposes.
Acquisition-Related Intangible Assets
Acquisition-related intangible assets, included in other assets, are subject to amortization on a straight-line basis over their estimated useful lives, as we believe this method most closely reflects the pattern in which the economic benefits of the assets will be consumed. Acquisition-related intangible assets, excluding those that are fully amortized, were as follows (in millions, except years):
June 30, 2025December 31, 2024
Weighted-Average Remaining Useful Lives (in years)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Developed technology4.5$241.1 $(125.0)$116.1 $154.9 $(119.2)$35.7 
Customer relationships6.6224.3 (33.4)190.9 54.6 (29.5)25.1 
Trade name4.924.9 (12.1)12.8 12.4 (11.2)1.2 
Total 5.8$490.3 $(170.5)$319.8 $221.9 $(159.9)$62.0 
Future estimated amortization expense related to acquisition-related intangible assets is as follows (in millions):
Future Amortization Expense
Remainder of 2025$31.1 
202661.2 
202757.4 
202854.0 
2029 and thereafter116.1 
Total $319.8