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Information About Segments of Business (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |
Consolidated revenues |  | $ 2,208.5 |  | $ 1,871.7 |  | $ 4,322.6 |  | $ 3,887.6 |
Gain (Loss) on Investments |  | (7.3) |  | (140.5) |  | 47.7 |  | 26.6 |
Consolidated Income (Loss) Before Taxes (Credits) [Abstract] |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments |  | (7.3) |  | (140.5) |  | 47.7 |  | 26.6 |
Consolidated Income Tax Expense (Credits) [Abstract] |  |  |  |  |  |  |  |  |
Income tax expense (credits) |  | 51.7 |  | 21.4 |  | 113.3 |  | 103.4 |
Income tax expense (credits) on consolidated net realized investment gains (losses) |  | (2.6) |  | (29.9) |  | 9.1 |  | 5.2 |
Premiums Earned, Net |  | 1,926.7 |  | 1,725.9 |  | 3,709.6 |  | 3,300.5 |
Title, escrow, and other fees |  | 67.9 |  | 71.5 |  | 126.1 |  | 139.5 |
Total premiums and fees |  | 1,994.6 |  | 1,797.4 |  | 3,835.7 |  | 3,440.1 |
Total Operating Revenues |  | 2,215.8 |  | 2,012.2 |  | 4,274.9 |  | 3,861.0 |
Income (loss) before income taxes (credits) and realized investment gains or losses |  | 267.5 |  | 253.8 |  | 520.2 |  | 485.4 |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  | 260.1 |  | 113.3 |  | 567.9 |  | 512.1 |
Realized from actual transactions and impairments |  | (2.4) |  | (54.1) |  | 34.9 |  | 126.2 |
Equity Securities, FV-NI, Unrealized Gain (Loss) |  | (4.9) |  | (86.3) |  | 12.7 |  | (99.6) |
Income taxes (credits) on above |  | 54.3 |  | 51.3 |  | 104.1 |  | 98.2 |
Premiums Written, Net |  | 1,993.8 |  | 1,843.5 |  | 3,816.2 |  | 3,483.6 |
Other income |  | 49.6 |  | 47.3 |  | 96.8 |  | 89.2 |
Policyholder Benefits and Claims Incurred, Net | [1] | 826.5 |  | 731.5 |  | 1,598.6 |  | 1,426.1 |
Dividends to policyholders | [1] | 4.1 |  | 10.0 |  | 9.7 |  | 12.8 |
Insurance Commissions | [1] | 577.9 |  | 528.3 |  | 1,093.8 |  | 975.8 |
Taxes and Licenses | [1] | 59.4 |  | 52.9 |  | 113.1 |  | 99.7 |
Commissions, Insurance taxes, licenses, and fees | [1] | 637.3 |  | 581.2 |  | 1,206.9 |  | 1,075.5 |
General expenses, taxes and fees | [1] | 462.6 |  | 413.3 |  | 903.8 |  | 822.2 |
Underwriting Acquisition And Other Expenses | [1] | 1,099.9 |  | 994.5 |  | 2,110.7 |  | 1,897.8 |
Segment underwriting income (loss) |  | 113.6 |  | 108.6 |  | 213.4 |  | 192.5 |
Net investment income |  | 171.5 |  | 167.4 |  | 342.2 |  | 331.6 |
Interest and other charges |  | 17.6 |  | 22.2 |  | 35.5 |  | 38.7 |
Net income excluding investment gains (losses) |  | 213.2 |  | 202.4 |  | 416.0 |  | 387.2 |
Net realized gains (losses) |  | (4.7) |  | (110.6) |  | 38.5 |  | 21.4 |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  | 208.4 |  | 91.8 |  | 454.5 |  | 408.6 |
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Noncontrolling Interest |  | $ 3.9 |  | $ 0.0 |  | $ 5.0 |  | $ 0.0 |
Combined Ratio |  | 93.60% |  | 93.50% |  | 93.70% |  | 93.80% |
Total net income |  | $ 204.4 |  | $ 91.8 |  | $ 449.5 |  | $ 408.6 |
Total Company Segments [Member] | Title Insurance |  |  |  |  |  |  |  |  |
Consolidated Income Tax Expense (Credits) [Abstract] |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  | 629.8 |  | 591.9 |  | 1,176.8 |  | 1,069.3 |
Title, escrow, and other fees |  | 67.9 |  | 71.5 |  | 126.1 |  | 139.5 |
Total premiums and fees |  | 697.8 |  | 663.4 |  | 1,302.9 |  | 1,208.8 |
Income (loss) before income taxes (credits) and realized investment gains or losses |  | 24.2 |  | 46.0 |  | 28.6 |  | 48.4 |
Income taxes (credits) on above |  | 5.0 |  | 9.4 |  | 6.0 |  | 9.9 |
Premiums Written, Net |  | 629.8 |  | 591.9 |  | 1,176.8 |  | 1,069.3 |
Other income |  | 0.1 |  | 0.3 |  | 0.3 |  | 0.4 |
Policyholder Benefits and Claims Incurred, Net | [1] | 20.3 |  | 15.3 |  | 36.3 |  | 27.4 |
Dividends to policyholders | [1] | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |
Insurance Commissions | [1] | 429.0 |  | 398.0 |  | 805.5 |  | 730.9 |
Taxes and Licenses | [1] | 9.6 |  | 9.1 |  | 18.6 |  | 17.0 |
Commissions, Insurance taxes, licenses, and fees | [1] | 438.6 |  | 407.1 |  | 824.1 |  | 747.9 |
General expenses, taxes and fees | [1] | 232.0 |  | 211.0 |  | 448.0 |  | 417.2 |
Underwriting Acquisition And Other Expenses | [1] | 670.7 |  | 618.2 |  | 1,272.1 |  | 1,165.1 |
Segment underwriting income (loss) |  | 6.9 |  | 30.2 |  | (5.2) |  | 16.7 |
Net investment income |  | 17.3 |  | 15.5 |  | 34.0 |  | 31.2 |
Interest and other charges |  | 0.0 |  | (0.3) |  | 0.1 |  | (0.4) |
Net income excluding investment gains (losses) |  | $ 19.2 |  | $ 36.5 |  | $ 22.6 |  | $ 38.4 |
Combined Ratio |  | 99.00% |  | 95.40% |  | 100.40% |  | 98.60% |
Total Company Segments [Member] | Specialty Insurance Group |  |  |  |  |  |  |  |  |
Consolidated Income Tax Expense (Credits) [Abstract] |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  | $ 1,294.5 |  | $ 1,129.6 |  | $ 2,528.1 |  | $ 2,221.3 |
Title, escrow, and other fees |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |
Total premiums and fees |  | 1,294.5 |  | 1,129.6 |  | 2,528.1 |  | 2,221.3 |
Income (loss) before income taxes (credits) and realized investment gains or losses |  | 253.7 |  | 202.5 |  | 513.9 |  | 422.9 |
Income taxes (credits) on above |  | 51.6 |  | 41.6 |  | 104.7 |  | 86.5 |
Premiums Written, Net |  | 1,361.0 |  | 1,247.2 |  | 2,633.1 |  | 2,404.4 |
Other income |  | 49.3 |  | 47.0 |  | 96.4 |  | 88.8 |
Policyholder Benefits and Claims Incurred, Net | [1] | 805.5 |  | 716.5 |  | 1,561.0 |  | 1,398.0 |
Dividends to policyholders | [1] | 4.1 |  | 10.0 |  | 9.7 |  | 12.8 |
Insurance Commissions | [1] | 148.4 |  | 130.2 |  | 288.0 |  | 244.7 |
Taxes and Licenses | [1] | 50.1 |  | 43.8 |  | 92.8 |  | 81.6 |
Commissions, Insurance taxes, licenses, and fees | [1] | 198.5 |  | 174.1 |  | 380.8 |  | 326.4 |
General expenses, taxes and fees | [1] | 215.6 |  | 190.8 |  | 426.8 |  | 381.9 |
Underwriting Acquisition And Other Expenses | [1] | 414.2 |  | 364.9 |  | 807.7 |  | 708.3 |
Segment underwriting income (loss) |  | 119.9 |  | 85.1 |  | 246.1 |  | 190.9 |
Net investment income |  | 149.9 |  | 132.9 |  | 299.9 |  | 264.0 |
Interest and other charges |  | 16.1 |  | 15.4 |  | 32.1 |  | 31.9 |
Net income excluding investment gains (losses) |  | $ 202.1 |  | $ 160.9 |  | $ 409.2 |  | $ 336.4 |
Combined Ratio |  | 90.70% |  | 92.40% |  | 90.20% |  | 91.40% |
Total Company Segments [Member] | Other |  |  |  |  |  |  |  |  |
Consolidated Income Tax Expense (Credits) [Abstract] |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  | $ 2.3 |  | $ 4.3 |  | $ 4.6 |  | $ 9.9 |
Title, escrow, and other fees |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |
Total premiums and fees |  | 2.3 |  | 4.3 |  | 4.6 |  | 9.9 |
Income (loss) before income taxes (credits) and realized investment gains or losses |  | (10.5) |  | 5.2 |  | (22.3) |  | 14.0 |
Income taxes (credits) on above |  | (2.3) |  | 0.2 |  | (6.5) |  | 1.7 |
Premiums Written, Net |  | 2.8 |  | 4.3 |  | 6.2 |  | 9.8 |
Other income |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |
Policyholder Benefits and Claims Incurred, Net | [1] | 0.7 |  | (0.3) |  | 1.2 |  | 0.6 |
Dividends to policyholders | [1] | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |
Insurance Commissions | [1] | 0.4 |  | 0.0 |  | 0.2 |  | 0.0 |
Taxes and Licenses | [1] | (0.3) |  | (0.1) |  | 1.6 |  | 1.0 |
Commissions, Insurance taxes, licenses, and fees | [1] | 0.0 |  | 0.0 |  | 1.8 |  | 1.1 |
General expenses, taxes and fees | [1] | 14.9 |  | 11.3 |  | 28.9 |  | 23.1 |
Underwriting Acquisition And Other Expenses | [1] | 15.0 |  | 11.3 |  | 30.8 |  | 24.3 |
Segment underwriting income (loss) |  | (13.3) |  | (6.6) |  | (27.4) |  | (15.1) |
Net investment income |  | 20.3 |  | 34.7 |  | 40.2 |  | 68.7 |
Interest and other charges |  | 17.6 |  | 22.7 |  | 35.2 |  | 39.5 |
Net income excluding investment gains (losses) |  | (8.2) |  | 4.9 |  | (15.8) |  | 12.3 |
Segment Reporting, Reconciling Item, Corporate Nonsegment |  |  |  |  |  |  |  |  |
Consolidated Income Tax Expense (Credits) [Abstract] |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
Title, escrow, and other fees |  | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
Total premiums and fees |  | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
Income (loss) before income taxes (credits) and realized investment gains or losses |  | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
Income taxes (credits) on above |  | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
Premiums Written, Net |  | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
Other income |  | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
Policyholder Benefits and Claims Incurred, Net | [1] | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
Dividends to policyholders | [1] | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
Insurance Commissions | [1] | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
Taxes and Licenses | [1] | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
Commissions, Insurance taxes, licenses, and fees | [1] | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
General expenses, taxes and fees | [1] | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
Underwriting Acquisition And Other Expenses | [1] | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
Segment underwriting income (loss) |  | 0.0 | [2] | 0.0 | [3] | 0.0 | [4] | 0.0 | [5]
Net investment income |  | (16.1) | [2] | (15.6) | [3] | (32.0) | [4] | (32.3) | [5]
Interest and other charges |  | (16.1) | [2] | (15.6) | [3] | (32.0) | [4] | (32.3) | [5]
Net income excluding investment gains (losses) |  | $ 0.0 | [2] | $ 0.0 | [3] | $ 0.0 | [4] | $ 0.0 | [5]
[1] | (b) The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM. There are no other segment expenses that are part of reported segment profit or loss amounts that are not included in one of the above categories.
[2] | (a) Includes intercompany financing arrangements for which interest charges were $16.1 for the quarter ended June 30, 2025.
[3] | (a) Includes intercompany financing arrangements for which interest charges were $15.6 for the quarter ended June 30, 2024.
[4] | (a) Includes intercompany financing arrangements for which interest charges were $32.0 for the six months ended June 30, 2025.
[5] | (a) Includes intercompany financing arrangements for which interest charges were $32.3 for the six months ended June 30, 2024.

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