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Schedule V Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Allowance for expected credit losses (deducted from accounts and premiums receivable) |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Year |  | $ 26.8 | $ 29.5 | $ 32.5
Additions Charged to Costs and Expenses |  | 7.8 | 8.0 | 11.3
Deductions | [1] | 8.5 | 10.7 | 14.3
Balance at End of Year |  | 26.1 | 26.8 | 29.5
Allowance for expected credit losses (deducted from reinsurance recoverable) |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Year |  | 1.5 | 1.7 | 1.7
Additions Charged to Costs and Expenses |  | 0.1 | 0.3 | 0.1
Deductions | [1] | 0.2 | 0.5 | 0.1
Balance at End of Year |  | $ 1.4 | $ 1.5 | $ 1.7
[1] | Deductions include amounts deemed to reduce exposure of expected losses on premium and accounts receivables and reinsurance recoverable, amounts deemed uncollectible, and amounts related to fluctuations in the foreign currency exchange rate.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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