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Closed Block - Change in Maximum Future Earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in maximum future earnings of the Closed Block
Maximum future earnings to be recognized from Closed Block assets and liabilities, beginning of year	$ 319.6	$ 344.5	$ 379.2
Maximum future earnings to be recognized from Closed Block assets and liabilities, end of year	301.1	319.6	344.5
Change in maximum future earnings	$ (18.5)	$ (24.9)	$ (34.7)

X

- Definition

The carrying amount of closed block liabilities in excess of the carrying amount of closed block assets at the date of demutualization (adjusted to eliminate the impact of related amounts in accumulated other comprehensive income).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 944
-SubTopic 805
-Section 55
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477301/944-805-55-4

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 944
-SubTopic 805
-Section 50
-Paragraph 3
-Subparagraph (b)(9)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478072/944-805-50-3

+ Details

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Period Type:	instant

X

- Definition

Amount of increase (decrease) of closed block liabilities in excess of closed block assets at the date of demutualization.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 944
-SubTopic 805
-Section 55
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477301/944-805-55-4

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 944
-SubTopic 805
-Section 50
-Paragraph 3
-Subparagraph (b)(9)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478072/944-805-50-3

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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