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Investments - Hybrid Securities (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
--- | --- | --- | ---
Hybrid Instruments [Line Items] |  |  |
Hybrid securities | $ 888.3 | $ 1,010.3 | $ 1,120.3
Corporate debt securities |  |  |
Hybrid Instruments [Line Items] |  |  |
Hybrid securities | 475.5 | 531.3 | 520.1
Residential mortgage-backed securities |  |  |
Hybrid Instruments [Line Items] |  |  |
Hybrid securities | 272.5 | 323.9 | 448.7
Other asset-backed securities |  |  |
Hybrid Instruments [Line Items] |  |  |
Hybrid securities | 5.3 | 13.9 | 26.1
Redeemable preferred stocks |  |  |
Hybrid Instruments [Line Items] |  |  |
Hybrid securities | $ 135.0 | $ 141.2 | $ 125.4

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- Definition Fair value as of the balance sheet date of hybrid instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 15 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480991/815-15-45-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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