v3.26.1
Information About Segments of Business Reconciliation of Assets from Segment to Consolidated (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Segment Reporting    
Assets $ 31,592.4 $ 29,862.7
Intersegment Elimination [Member]    
Segment Reporting    
Assets [1] (168.1) (160.5)
Segment Reporting, Reconciling Item, Corporate Nonsegment    
Segment Reporting    
Assets 1,529.1 1,334.8
Specialty Insurance Group [Member] | Total Company Segments [Member]    
Segment Reporting    
Assets 28,249.2 26,750.6
Title Insurance | Total Company Segments [Member]    
Segment Reporting    
Assets 1,982.2 1,937.7
Total of major segments | Total Company Segments [Member]    
Segment Reporting    
Assets $ 30,231.4 $ 28,688.4
[1] (a) Includes predominately intercompany debt and various reclassifications