v3.26.3
Segment Information (Schedule of Revenues by Segment) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting Information [Line Items]        
Total revenues $ 2,084.6 $ 1,978.9 $ 6,039.9 $ 5,402.5
Direct premiums and escrow fees 749.8 708.0 2,204.1 1,973.3
Agent premiums 868.4 798.8 2,447.5 2,169.9
Information and other 297.9 282.0 880.8 794.3
Net investment income 170.1 163.8 506.2 459.2
Net investment gains (losses) (1.4) (2.0) (4.2) (8.9)
Operating Segments        
Segment Reporting Information [Line Items]        
Total revenues 2,084.6 1,978.9 6,039.9 5,402.5
Direct premiums and escrow fees 749.8 708.0 2,204.1 1,973.3
Agent premiums 868.4 798.8 2,447.5 2,169.9
Information and other 297.9 282.0 880.8 794.3
Net investment income 170.1 163.8 506.2 459.2
Net investment gains (losses) (1.6) 26.3 1.3 5.8
Operating Segments | Title Insurance and Services        
Segment Reporting Information [Line Items]        
Total revenues 1,972.9 1,835.9 5,719.8 5,043.2
Direct premiums and escrow fees 642.8 601.5 1,889.1 1,661.5
Agent premiums 868.4 798.8 2,447.5 2,169.9
Information and other 292.2 276.1 856.4 776.4
Net investment income 169.3 153.1 487.5 437.9
Net investment gains (losses) 0.2 6.4 39.3 (2.5)
Operating Segments | Home Warranty        
Segment Reporting Information [Line Items]        
Total revenues 114.7 114.6 338.3 332.6
Direct premiums and escrow fees 107.1 106.6 315.0 311.9
Agent premiums 0.0 0.0 0.0 0.0
Information and other 5.8 5.7 17.9 17.8
Net investment income 1.6 1.4 4.2 3.4
Net investment gains (losses) 0.2 0.9 1.2 (0.5)
Operating Segments | Corporate and Eliminations        
Segment Reporting Information [Line Items]        
Total revenues (3.0) 28.4 (18.2) 26.7
Direct premiums and escrow fees (0.1) (0.1) 0.0 (0.1)
Agent premiums 0.0 0.0 0.0 0.0
Information and other (0.1) 0.2 6.5 0.1
Net investment income (0.8) 9.3 14.5 17.9
Net investment gains (losses) $ (2.0) $ 19.0 $ (39.2) $ 8.8