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Short- Duration Insurance Contracts - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Property & Casualty
Net Amount at Risk by Product and Guarantee [Line Items]
Favorable (unfavorable) development of total reserves for claims occurring in prior years	$ 3.0	$ 13.0	$ 13.8	$ 19.2
Group Benefits
Net Amount at Risk by Product and Guarantee [Line Items]
Favorable (unfavorable) development of total reserves for claims occurring in prior years	$ 2.6	$ 3.9	$ 5.2	$ 13.2

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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

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479808/944-20-55-15

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