Note 12—Goodwill and Other Intangible Assets

​

The changes in the carrying amount of goodwill by segment were as follows:

​

​

The increase in goodwill during 2025 was primarily driven by goodwill recognized from the 2025 Acquisitions, in particular, the Andrew and Trexon acquisitions, and foreign currency translation. The increase in goodwill during 2024 was primarily driven by goodwill recognized from the 2024 Acquisitions, in particular, the CIT acquisition, partially offset by foreign currency translation.

​

Other than goodwill noted above, the Company’s intangible assets as of December 31, 2025 and 2024 were as follows:

​

​

The increase in the gross carrying amount of intangible assets in 2025 was primarily driven by certain customer relationships, proprietary technology and acquired backlog recognized as a result of the acquisition accounting associated with the 2025 Acquisitions, in particular, the Andrew and Trexon acquisitions. Amortization expense for the years ended December 31, 2025, 2024 and 2023 was approximately $192.0, $154.7 and $86.0, respectively, which included the amortization of acquired backlog of $28.2, $55.0 and $12.4, respectively, resulting from acquisitions in each respective year. The amortization of acquired backlog in 2025 primarily resulted from the Andrew and Trexon acquisitions. The amortization of acquired backlog in 2024 resulted from the CIT acquisition. As of December 31, 2025, amortization expense relating to the Company’s current intangible assets estimated for each of the next five fiscal years is approximately $207.0 in 2026, $176.7 in 2027, $169.5 in 2028, $158.6 in 2029, and $155.9 in 2030.