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Investments Hybrid Securities (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Hybrid Instruments [Line Items]
Hybrid securities	$ 242.2	$ 189.4	$ 188.5
State and local government obligations
Hybrid Instruments [Line Items]
Hybrid securities	0.0	3.5	3.5
Corporate debt securities
Hybrid Instruments [Line Items]
Hybrid securities	101.0	91.2	91.3
Other asset-backed securities
Hybrid Instruments [Line Items]
Hybrid securities	18.7	2.6	3.0
Redeemable preferred stocks
Hybrid Instruments [Line Items]
Hybrid securities	$ 122.5	$ 92.1	$ 90.7

X

- Definition

Fair value as of the balance sheet date of hybrid instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 15
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=116690713&loc=d3e50806-113969

+ Details

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- Definition

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+ References

No definition available.

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