| Intangible Assets |
Intangible Assets Intangible assets consisted of the following: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | March 31, 2026 | | December 31, 2025 | | Gross | | Accumulated
Amortization | | Net | | Gross | | Accumulated
Amortization | | Net | | Customer relationships | $ | 2,203.8 | | | $ | (712.7) | | | $ | 1,491.1 | | | $ | 2,085.9 | | | $ | (684.9) | | | $ | 1,401.0 | | | Internal use software | 1,822.1 | | | (885.3) | | | 936.8 | | | 1,778.3 | | | (822.8) | | | 955.5 | | | Database and credit files | 1,784.5 | | | (1,030.0) | | | 754.5 | | | 1,383.0 | | | (1,010.4) | | | 372.6 | | | Trademarks, copyrights and patents | 582.3 | | | (201.7) | | | 380.6 | | | 566.4 | | | (197.9) | | | 368.6 | | | Noncompete and other agreements | 1.0 | | | (0.3) | | | 0.8 | | | 1.2 | | | (0.3) | | | 0.8 | | | Total intangible assets | $ | 6,393.8 | | | $ | (2,830.0) | | | $ | 3,563.8 | | | $ | 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 acquisition | 576.0 | | | — | | | 576.0 | | | Developed internal use software | 46.7 | | | — | | | 46.7 | | | | | | | | | Amortization | — | | | (123.8) | | | (123.8) | | | Disposals and retirements | (2.2) | | | 1.5 | | | (0.6) | | | Foreign exchange rate adjustment | (41.5) | | | 8.6 | | | (32.9) | | | Balance, March 31, 2026 | $ | 6,393.8 | | | $ | (2,830.0) | | | $ | 3,563.8 | |
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