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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

X

- 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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- Details

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- Details

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- Details

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