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Closed Block - Revenues and Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues
Closed Block: Premiums and other considerations	$ 153.0	$ 166.1	$ 178.0
Closed Block: Net investment income (loss)	130.6	127.3	129.1
Closed Block: Net realized capital gains (losses)	(11.2)	(10.0)	(21.2)
Closed Block: Total revenues	272.4	283.4	285.9
Expenses
Closed Block: Benefits, claims and settlement expenses	151.1	161.6	184.3
Closed Block: Dividends to policyholders	97.4	86.8	92.5
Closed Block: Operating expenses	1.9	2.6	2.2
Closed Block: Total expenses	250.4	251.0	279.0
Closed Block revenues, net of Closed Block expenses, before income taxes	22.0	32.4	6.9
Closed Block: Income taxes	4.2	6.1	0.7
Closed Block revenues, net of Closed Block expenses and income taxes	17.8	26.3	6.2
Funding adjustments and other transfers	0.7	(1.4)	28.5
Closed Block revenues, net of Closed Block expenses, income taxes and funding adjustments	$ 18.5	$ 24.9	$ 34.7

X

- Definition

Provision for benefits, claims and claims settlement expenses incurred during the period allocated to an insurance entity's segregated group of participating or dividend-paying policies and contracts (known as a closed block).

+ References

No definition available.

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- Definition

Operating expenses impacting an insurance entity's segregated group of participating or dividend-paying policies and contracts along with the assets allocated to them (known as a closed block).

+ References

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- Definition

Amounts charged to the closed block during the period necessary to properly fund for certain adjustments, such as face amount and premium increases, due to the adjustable life policies included in the closed block. Also includes other related transfers.

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- 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

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-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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- Definition

Amount of benefits, claims and expenses that are related to an insurance entity's segregated group of participating or dividend-paying policies and contracts along with the assets allocated to them (known as a closed block). Includes, but is not limited to, death benefits, matured endowments, participating dividends, general expenses and deferred acquisition costs related to the closed block.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 944
-SubTopic 805
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478072/944-805-50-3

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- Definition

The amount of income tax expense or benefit allocated to the operations of the closed block for the period.

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-Name Accounting Standards Codification
-Topic 944
-SubTopic 805
-Section 50
-Paragraph 3
-Subparagraph (b)
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- Definition

Income for the period from the investments allocated to an insurance entity's segregated group of participating or dividend-paying policies and contracts (known as a closed block), net of investment expenses, which are typically reported in a table of closed block operations.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 944
-SubTopic 805
-Section 50
-Paragraph 3
-Subparagraph (b)(5)
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-URI https://asc.fasb.org/1943274/2147478072/944-805-50-3

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- Definition

Amount of net income (loss) from operations of the closed block.

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-SubTopic 805
-Section 50
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- Definition

An expense for the period representing distributions paid or accrued for the segregated group of participating or dividend-paying policies and contracts along with the assets allocated to them (known as a closed block), which may be presented in a table of closed block operations as part of summarized financial data.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 944
-SubTopic 805
-Section 50
-Paragraph 3
-Subparagraph (b)(8)
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For the segregated group of participating or dividend-paying policies and contracts along with the assets allocated to them (known as a closed block), revenue for the period from insurance policy premiums; typically included in a table of closed block operations.

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- Definition

Gains and losses realized for the period from the investments allocated to an insurance entity's segregated group of participating or dividend-paying policies and contracts (known as a closed block).

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The revenues less expenses from operations of the closed block during the period, before income taxes allocated thereto.

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-SubTopic 805
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- Definition

Total revenues from an insurance company's segregated group of participating or dividend-paying policies and contracts along with the assets allocated to them (known as a closed block).

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