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v3.25.4

Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Embedded Derivative in Modified Coinsurance Arrangement |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation |  |  |
Derivatives Measured with Unobservable Inputs, Beginning Balance |  | $ 11.5 | $ (1.5)
Derivative Liability Gain (Loss) Included in Earnings |  | 6.3 | 13.0
Derivative Liability Gain (Loss) Included in OCI |  | 0.0 | 0.0
Derivative Purchases |  | 0.0 | 0.0
Derivative Sales |  | 0.0 | 0.0
Derivative Transfers Into Level 3 |  | 0.0 | 0.0
Derivative Transfers Out of Level 3 |  | 0.0 | 0.0
Derivatives Measured with Unobservable Inputs, Ending Balance |  | 17.8 | 11.5
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI |  | 0.0 | 0.0
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 6.3 | 13.0
Public Utilities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |  |
Assets Measured with Unobservable Inputs, Beginning Balance |  | 0.0 | 0.0
Investment Gain (Loss) included in Earnings |  | (1.5) | (1.1)
Investment Gain (Loss) included in OCI |  | 1.9 | 1.3
Investment Purchases |  | 0.0 | 0.0
Investment Sales |  | (43.7) | (20.4)
Investment Level 3 Transfers Into |  | 43.3 | 20.2
Investment Level 3 Transfers Out of |  | 0.0 | 0.0
Assets Measured with Unobservable Inputs, Ending Balance |  | 0.0 | 0.0
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in OCI |  | 0.0 | 0.0
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in Earnings |  | 0.0 | 0.0
Mortgage/Asset-backed Securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |  |
Assets Measured with Unobservable Inputs, Beginning Balance | [1] | 73.5 | 32.9
Investment Gain (Loss) included in Earnings | [1] | 0.0 | 0.0
Investment Gain (Loss) included in OCI | [1] | 0.3 | 0.6
Investment Purchases | [1] | 38.0 | 38.5
Investment Sales | [1] | (8.6) | (2.6)
Investment Level 3 Transfers Into | [1] | 0.0 | 4.1
Investment Level 3 Transfers Out of | [1] | 0.1 | 0.0
Assets Measured with Unobservable Inputs, Ending Balance | [1] | 103.1 | 73.5
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in OCI | [1] | (0.3) | (0.6)
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in Earnings | [1] | 0.0 | 0.0
All Other Corporate Bonds |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |  |
Assets Measured with Unobservable Inputs, Beginning Balance |  | 71.5 | 123.4
Investment Gain (Loss) included in Earnings |  | (6.2) | (3.5)
Investment Gain (Loss) included in OCI |  | 9.1 | 8.9
Investment Purchases |  | 21.8 | 3.2
Investment Sales |  | (268.6) | (329.8)
Investment Level 3 Transfers Into |  | 274.6 | 318.1
Investment Level 3 Transfers Out of |  | 38.3 | 48.8
Assets Measured with Unobservable Inputs, Ending Balance |  | 63.9 | 71.5
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in OCI |  | (7.7) | (8.9)
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in Earnings |  | 0.0 | 0.0
Fixed Maturity Securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |  |
Assets Measured with Unobservable Inputs, Beginning Balance |  | 145.0 | 156.3
Investment Gain (Loss) included in Earnings |  | (7.7) | (4.6)
Investment Gain (Loss) included in OCI |  | 11.3 | 10.8
Investment Purchases |  | 59.8 | 41.7
Investment Sales |  | (320.9) | (352.8)
Investment Level 3 Transfers Into |  | 317.9 | 342.4
Investment Level 3 Transfers Out of |  | 38.4 | 48.8
Assets Measured with Unobservable Inputs, Ending Balance |  | 167.0 | 145.0
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in OCI |  | (8.0) | (9.5)
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in Earnings |  | 0.0 | 0.0
Perpetual Preferred Securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |  |
Assets Measured with Unobservable Inputs, Beginning Balance |  | 24.4 | 21.6
Investment Gain (Loss) included in Earnings |  | 13.5 | 2.3
Investment Gain (Loss) included in OCI |  | 0.0 | 0.0
Investment Purchases |  | 4.7 | 0.5
Investment Sales |  | (22.8) | 0.0
Investment Level 3 Transfers Into |  | 0.0 | 0.0
Investment Level 3 Transfers Out of |  | 0.0 | 0.0
Assets Measured with Unobservable Inputs, Ending Balance |  | 19.8 | 24.4
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in OCI |  | 0.0 | 0.0
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in Earnings |  | $ 0.8 | $ 2.3
[1] | Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types.

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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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