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SCHEDULE VI SUPPLEMENTAL INFORMATION CONCERNING PROPERTY AND CASUALTY INSURANCE OPERATIONS (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net incurred losses and LAE in respect of losses occurring in current year |  | $ 3,825.7 | $ 3,866.8 | $ 4,150.5 |
Net incurred losses and LAE in respect of losses occurring in prior years |  | 96.4 | 109.4 | 15.9 |
Reinsurance Recoverable On Unpaid Losses Property Casualty Liability |  | 1,850.3 | 1,829.8 | 1,795.0 | $ 1,748.6
Prepaid premiums, gross |  | 98.1 | 90.5 |  |
Consolidated Property and Casualty Insurance Entity [Member] |  |  |  |  |
Deferred acquisition costs |  | 703.0 | 662.8 |  |
Reserves for unpaid claims and claim adjustment expenses | [1] | 7,755.2 | 7,461.2 |  |
Unearned premiums | [1] | 3,440.4 | 3,283.3 |  |
Earned premiums |  | 6,161.1 | 5,912.6 | 5,663.1 |
Net investment income |  | 454.4 | 372.6 | 332.1 |
Net incurred losses and LAE in respect of losses occurring in current year |  | 3,825.7 | 3,866.8 | 4,150.5 |
Net incurred losses and LAE in respect of losses occurring in prior years |  | (96.4) | (109.4) | (15.9) |
Amortization of deferred acquisition costs |  | 1,285.2 | 1,221.7 | 1,176.0 |
Paid claims and claim adjustment expenses |  | 3,455.8 | 3,639.1 | 3,885.5 |
Premiums written |  | $ 6,322.1 | $ 6,083.6 | $ 5,810.2 |
[1] | Reserves for unpaid claims and claim adjustment expenses are shown gross of $1,850.3 million and $1,829.8 million of reinsurance recoverable on unpaid losses in 2025 and 2024, respectively. Unearned premiums are shown gross of prepaid premiums of $98.1 million and $90.5 million in 2025 and 2024, respectively. Reserves for unpaid claims and claim adjustment expenses also include policyholder dividends.

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- Definition The unexpired portion of premiums ceded on policies in force as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-11 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-12 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 825 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477351/944-825-50-1B Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 340 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479510/944-340-25-1 + Details
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- Definition Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + Details
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