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Reserve for Known and Incurred but Not Reported Claims (Summary of Loss Reserves) (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Insurance [Abstract] |  |  |  |
Known title claims, amount | $ 61.6 | $ 55.5 |  |
Incurred but not reported claims, amount | 1,162.5 | 1,186.5 |  |
Total title claims, amount | 1,224.1 | 1,242.0 |  |
Non-title claims, amount | 37.5 | 40.4 |  |
Total loss reserves, amount | $ 1,261.6 | $ 1,282.4 | $ 1,314.5 | $ 1,325.3
Known title claims, percent | 4.90% | 4.30% |  |
Incurred but not reported claims, percent | 92.10% | 92.50% |  |
Total title claims, percent | 97.00% | 96.80% |  |
Non-title claims, percent | 3.00% | 3.20% |  |
Total loss reserves, percent | 100.00% | 100.00% |  |

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- Definition Estimated costs as of the balance sheet date of settling nontitle claims and claims adjustment expense. + References No definition available. + Details
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- Definition Non-title claims as a percentage of the liability for claims and claims adjustment expense. + References No definition available. + Details
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- Definition Incurred but not reported IBNR claims as a percentage of the liability for claims and claims adjustment expense. + References No definition available. + Details
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- Definition Known title claims as a percentage of the liability for claims and claims adjustment expense. + References No definition available. + Details
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- Definition Known title claims and incurred but not reported IBNR claims as a percentage of the liability for claims and claims adjustment expense. + References No definition available. + Details
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- Definition Total claims as a percentage of the liability for claims and claims adjustment expense. + References No definition available. + Details
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- References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling asserted and unasserted claims estimated to have been incurred by the insureds on or before the balance sheet date pertaining to the existence of a lien, encumbrance, defect or other matter purportedly affecting the title to the interest as insured. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.W) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479583/944-40-S99-1 + Details
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- Definition Costs of settling insured claims and costs incurred in the claims settlement process for the specified year specifically for claims that have already been submitted to the insurance company for reimbursement. + References No definition available. + Details
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