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Investments - Hybrid Securities (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Hybrid Instruments [Line Items] |  |  |
Hybrid securities | $ 1,077.7 | $ 1,221.7 | $ 1,235.6
Corporate debt securities |  |  |
Hybrid Instruments [Line Items] |  |  |
Hybrid securities | 511.1 | 535.4 | 500.4
Residential mortgage-backed securities |  |  |
Hybrid Instruments [Line Items] |  |  |
Hybrid securities | 410.8 | 509.6 | 550.8
Other asset-backed securities |  |  |
Hybrid Instruments [Line Items] |  |  |
Hybrid securities | 19.4 | 42.0 | 51.4
Redeemable preferred stocks |  |  |
Hybrid Instruments [Line Items] |  |  |
Hybrid securities | $ 136.4 | $ 134.7 | $ 133.0

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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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