v3.26.1
Intangible Assets - Summary (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Finite-Lived Intangible Assets [Line Items]    
Gross $ 6,393.8 $ 5,814.8
Accumulated Amortization (2,830.0) (2,716.3)
Net 3,563.8 3,098.5
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross 2,203.8 2,085.9
Accumulated Amortization (712.7) (684.9)
Net 1,491.1 1,401.0
Internal use software    
Finite-Lived Intangible Assets [Line Items]    
Gross 1,822.1 1,778.3
Accumulated Amortization (885.3) (822.8)
Net 936.8 955.5
Database and credit files    
Finite-Lived Intangible Assets [Line Items]    
Gross 1,784.5 1,383.0
Accumulated Amortization (1,030.0) (1,010.4)
Net 754.5 372.6
Trademarks, copyrights and patents    
Finite-Lived Intangible Assets [Line Items]    
Gross 582.3 566.4
Accumulated Amortization (201.7) (197.9)
Net 380.6 368.6
Noncompete and other agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross 1.0 1.2
Accumulated Amortization (0.3) (0.3)
Net $ 0.8 $ 0.8