| Intangible Asset, Finite-Lived |
Intangible assets consisted of the following: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2026 | | December 31, 2025 | | Gross | | Accumulated
Amortization | | Net | | Gross | | Accumulated
Amortization | | Net | | Customer relationships | $ | 2,187.0 | | | $ | (775.5) | | | $ | 1,411.5 | | | $ | 2,085.9 | | | $ | (684.9) | | | $ | 1,401.0 | | | Internal use software | 1,860.8 | | | (947.5) | | | 913.3 | | | 1,778.3 | | | (822.8) | | | 955.5 | | | Database and credit files | 1,824.2 | | | (1,093.6) | | | 730.6 | | | 1,383.0 | | | (1,010.4) | | | 372.6 | | | Trademarks, copyrights and patents | 583.0 | | | (209.8) | | | 373.1 | | | 566.4 | | | (197.9) | | | 368.6 | | | Noncompete and other agreements | 1.3 | | | (0.7) | | | 0.6 | | | 1.2 | | | (0.3) | | | 0.8 | | | Total intangible assets | $ | 6,456.3 | | | $ | (3,027.1) | | | $ | 3,429.2 | | | $ | 5,814.8 | | | $ | (2,716.3) | | | $ | 3,098.5 | |
Changes in the carrying amount of intangible assets between periods consisted of the following: | | | | | | | | | | | | | | | | | | | Gross | | Accumulated Amortization | | Net | Balance, December 31, 2025 | $ | 5,814.8 | | | $ | (2,716.3) | | | $ | 3,098.5 | | | Business acquisitions | 594.2 | | | — | | | 594.2 | | | Developed internal use software | 151.1 | | | — | | | 151.1 | | | Acquired intangible assets | 1.0 | | | — | | | 1.0 | | | Amortization | — | | | (390.9) | | | (390.9) | | | Disposals and retirements | (76.4) | | | 74.7 | | | (1.7) | | | Foreign exchange rate adjustment | (28.4) | | | 5.4 | | | (23.0) | | | Balance, September 30, 2026 | $ | 6,456.3 | | | $ | (3,027.1) | | | $ | 3,429.2 | |
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