Short-Term Duration Insurance Contracts - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Group Benefits
Net Amount at Risk by Product and Guarantee [Line Items]
Favorable development of total reserves for claims occurring in prior years	$ 4.9	$ 1.9

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.

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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration