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Segment Information (Schedule of Revenues by Segment) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Total revenues $ 1,978.9 $ 1,406.1 $ 5,402.5 $ 4,443.0
Direct premiums and escrow fees 708.0 639.6 1,973.3 1,773.2
Agent premiums 798.8 683.9 2,169.9 1,864.0
Information and other 282.0 247.5 794.3 717.1
Net investment income 163.8 146.6 459.2 404.4
Net investment (losses) gains (2.0) (326.6) (8.9) (331.0)
Operating Segments        
Segment Reporting Information [Line Items]        
Total revenues 1,978.9 [1] 1,406.4 [2] 5,402.6 [3] 4,444.4 [4]
Direct premiums and escrow fees 708.0 639.6 1,973.3 1,773.2
Agent premiums 798.8 683.9 2,169.9 1,864.0
Information and other 282.0 247.5 794.3 717.1
Net investment income 163.8 146.6 459.2 404.4
Net investment (losses) gains 26.3 (311.5) 5.8 (315.7)
Operating Segments | Title Insurance and Services        
Segment Reporting Information [Line Items]        
Total revenues 1,835.9 [1] 1,290.3 [2] 5,043.2 [3] 4,132.0 [4]
Direct premiums and escrow fees 601.5 536.2 1,661.5 1,472.4
Agent premiums 798.8 683.9 2,169.9 1,864.0
Information and other 276.1 241.7 776.4 699.8
Net investment income 153.1 136.5 437.9 378.9
Net investment (losses) gains 6.4 (308.0) (2.5) (283.1)
Operating Segments | Home Warranty        
Segment Reporting Information [Line Items]        
Total revenues 114.6 [1] 110.9 [2] 332.6 [3] 322.9 [4]
Direct premiums and escrow fees 106.6 103.5 311.9 300.8
Agent premiums 0.0 0.0   0.0
Information and other 5.7 5.7 17.8 17.4
Net investment income 1.4 1.2 3.4 3.2
Net investment (losses) gains 0.9 0.5 (0.5) 1.5
Operating Segments | Corporate and Eliminations        
Segment Reporting Information [Line Items]        
Total revenues 28.4 4.9 26.7 (11.9)
Direct premiums and escrow fees (0.1) (0.1) (0.1) 0.0
Agent premiums 0.0 0.0   0.0
Information and other 0.2 0.1 0.1 (0.1)
Net investment income 9.3 8.9 17.9 22.3
Net investment (losses) gains $ 19.0 $ (4.0) $ 8.8 $ (34.1)
[1] Intersegment revenue is included within amounts shown.
[2] Intersegment revenue is included within amounts shown.
[3] Intersegment revenue is included within amounts shown.
[4] Intersegment revenue is included within amounts shown.