NOTE 4. INTANGIBLE ASSETS AND GOODWILL Intangible assets consisted of the following: | | | | | | | | | | | | | | September 30, 2026 | | | Gross Carrying | | Accumulated | | Net Carrying | | Weighted-Average Remaining | | | Amount | | Amortization | | Amount | | Useful Life (in years) | | | | (in millions) | | | Technology | | $ | 100.9 | | $ | (81.4) | | $ | 19.5 | | 6.2 | Customer relationships | | | 170.3 | | | (94.6) | | | 75.7 | | 7.1 | Trademarks and other | | | 26.8 | | | (19.7) | | | 7.1 | | 2.9 | Total | | $ | 298.0 | | $ | (195.7) | | $ | 102.3 | | 6.6 | | | | | | | | | | | | | | | December 31, 2025 | | | Gross Carrying | | Accumulated | | Net Carrying | | Weighted-Average Remaining | | | Amount | | Amortization | | Amount | | Useful Life (in years) | | | | (in millions) | | | Technology | | $ | 101.8 | | $ | (78.2) | | $ | 23.6 | | 6.6 | Customer relationships | | | 171.4 | | | (86.3) | | | 85.1 | | 7.7 | Trademarks and other | | | 27.3 | | | (18.3) | | | 9.0 | | 3.6 | Total | | $ | 300.5 | | $ | (182.8) | | $ | 117.7 | | 7.2 |
Amortization expense related to intangible assets is as follows: | | | | | | | | | | | | | | | | Three Months Ended September 30, | | Nine Months Ended September 30, | | | | 2026 | | 2025 | | 2026 | | 2025 | | | | | (in millions) | | Amortization expense | | $ | 5.0 | | $ | 5.6 | | $ | 15.5 | | $ | 16.7 | |
Estimated future amortization expense related to intangibles is as follows: | | | | Year Ending December 31, | | | (in millions) | 2026 (remaining) | | $ | 4.8 | 2027 | | | 17.8 | 2028 | | | 16.6 | 2029 | | | 15.0 | 2030 | | | 13.4 | Thereafter | | | 34.7 | Total | | $ | 102.3 |
The following table summarizes the changes in goodwill: | | | | | | (in millions) | December 31, 2025 | | $ | 300.8 | Foreign currency translation and other | | | (1.7) | September 30, 2026 | | $ | 299.1 |
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