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Segment Financial Information (Schedule of Information About Revenues by Segment) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | $ 6,128.1 |  | $ 6,003.5 |  | $ 7,605.2 |
Direct premiums and escrow fees | 2,446.0 |  | 2,252.1 |  | 3,084.8 |
Agent premiums | 2,561.9 |  | 2,449.3 |  | 3,547.6 |
Information and other | 960.8 |  | 938.5 |  | 1,148.5 |
Net investment income | 561.0 |  | 570.0 |  | 340.1 |
Net investment gains (losses) | (335.1) |  | (80.9) |  | (85.4) |
Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 6,129.6 | [1] | 6,004.8 | [2] | 7,607.7 | [3]
Direct premiums and escrow fees | 2,446.0 |  | 2,252.1 |  | 3,084.8 |
Agent premiums | 2,561.9 |  | 2,449.3 |  | 3,547.6 |
Information and other | 960.8 |  | 938.5 |  | 1,148.5 |
Net investment income | 561.0 |  | 570.0 |  | 340.1 |
Net investment gains (losses) | (401.6) |  | (206.4) |  | (515.8) |
Operating Segments | Title Insurance and Services |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 5,737.3 | [1] | 5,724.8 | [2] | 7,546.9 | [3]
Direct premiums and escrow fees | 2,048.3 |  | 1,856.4 |  | 2,662.9 |
Agent premiums | 2,561.9 |  | 2,449.3 |  | 3,547.6 |
Information and other | 938.2 |  | 917.1 |  | 1,127.1 |
Net investment income | 534.3 |  | 540.2 |  | 359.1 |
Net investment gains (losses) | (345.4) |  | (38.2) |  | (149.8) |
Operating Segments | Home Warranty |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 425.7 | [1] | 417.2 | [2] | 419.0 | [3]
Direct premiums and escrow fees | 397.8 |  | 395.6 |  | 413.1 |
Agent premiums | 0.0 |  | 0.0 |  | 0.0 |
Information and other | 22.5 |  | 21.7 |  | 13.3 |
Net investment income | 4.0 |  | 5.9 |  | 5.1 |
Net investment gains (losses) | 1.4 |  | (6.0) |  | (12.5) |
Operating Segments | Corporate and Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | (34.9) |  | (138.5) |  | (360.7) |
Direct premiums and escrow fees | (0.1) |  | 0.1 |  | 8.8 |
Agent premiums | 0.0 |  | 0.0 |  | 0.0 |
Information and other | 0.1 |  | (0.3) |  | 8.1 |
Net investment income | 22.7 |  | 23.9 |  | (24.1) |
Net investment gains (losses) | (57.6) |  | (162.2) |  | (353.5) |
Operating Segments | Corporate |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | (33.4) | [1] | (137.2) | [2] | (358.2) | [3]
Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | $ (1.5) |  | $ (1.3) |  | $ (2.5) |
[1] | Intersegment revenue is included within amounts shown.
[2] | Intersegment revenue is included within amounts shown.
[3] | Intersegment revenue is included within amounts shown.

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- Definition Fees associated with title search and related reports, title and other real property records and images, and other non-insured revenue. + References No definition available. + Details
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