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Closed Block - Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Closed Block liabilities and assets designated to the Closed Block
Closed Block liabilities: Policyholder dividend obligation	$ 0.0	$ 0.0
Closed Block liabilities
Closed Block liabilities: Future policy benefits and claims	2,850.0	2,982.9
Closed Block liabilities: Other policyholder funds	4.4	5.1
Closed Block liabilities: Policyholder dividends payable	155.1	157.2
Closed Block liabilities: Income taxes currently payable	1.3	4.0
Closed Block liabilities: Other liabilities	27.6	23.2
Total Closed Block liabilities	3,038.4	3,172.4
Assets designated to the Closed Block
Closed Block assets: Fixed maturities, available-for-sale	1,752.0	1,766.7
Closed Block assets: Fixed maturities, trading	0.7	2.0
Closed Block assets: Equity securities	0.9	0.9
Closed Block assets: Mortgage loans	413.3	469.5
Closed Block assets: Policy loans	353.6	379.9
Closed Block assets: Other investments	61.2	61.2
Closed Block assets: Total investments	2,581.7	2,680.2
Closed Block assets: Cash and cash equivalents		6.1
Closed Block assets: Accrued investment income	32.3	32.6
Closed Block assets: Reinsurance recoverable and deposit receivable	3.5	3.5
Closed Block assets: Premiums due and other receivables		3.4
Closed Block assets: Deferred tax asset	51.6	52.1
Closed Block assets: Other assets	2.0	5.3
Total assets designated to the Closed Block	2,671.1	2,783.2
Excess of Closed Block liabilities over assets designated to the Closed Block	367.3	389.2
Amounts included in accumulated other comprehensive income (loss)	(66.2)	(69.6)
Maximum future earnings to be recognized from Closed Block assets and liabilities	$ 301.1	$ 319.6	$ 344.5	$ 379.2

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- Definition

Amount expected to be recovered from reinsurers for reinsurance agreements pertaining to the closed block for which we use the reinsurance method of accounting and the unaccreted deposit balance for reinsurance agreements for which we use the deposit method of accounting.

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Amount of current income taxes payable under closed block liabilities as of balance sheet date.

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The sum of cash, cash equivalents, investments and other assets allocated to the segregated group of participating or dividend-paying policies and contracts identified as the closed block.

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Amount of accrued investment income held by the closed block.

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Cash and highly liquid, safe investments that can be readily converted into cash (cash equivalents) allocated to the segregated group of participating or dividend-paying policies and contracts identified as the closed block.

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Amount, after valuation allowance and deferred tax liability, of deferred tax asset pertaining to the closed block.

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Fair value of equity securities allocated to the segregated group of participating or dividend-paying policies and contracts identified as the closed block.

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Fair value of investments in debt securities that are deemed to be available for sale that are allocated to the segregated group of participating or dividend-paying policies and contracts identified as the closed block. Change in fair of such securities is a component of change in other comprehensive income in the period, which is reflected in the closed block disclosure.

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Carrying amount of investments in mortgage loans on real estate allocated to the segregated group of participating or dividend-paying policies and contracts identified as the closed block.

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Amount of other assets held by the closed block. Excludes other investments.

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Carrying amount of loans to policy holders secured by benefits under insurance policies that are allocated to the segregated group of participating or dividend-paying policies and contracts identified as the closed block.

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Amount, after the allowance for doubtful accounts, of premium and other receivables held by the closed block.

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Amount of investments in debt securities classified as trading that are held by the closed block.

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The increase or decrease in the period in other comprehensive income within the closed block comprised of the change in (a) dividend obligation to policyholders of the closed block, and (b) unrealized gain (loss) on available for sale securities allocated to the closed block.

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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).

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For the segregated group of participating or dividend-paying policies and contracts along with the assets backing them (known as a closed block), the total of future policy benefits, policyholder account balance, policyholder dividend obligation and any other closed block liabilities.

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The liability as of the balance sheet date for future benefits to be paid to or on behalf of policyholders and expenses, less the present value of future net premiums payable under the insurance contracts and the policy cash accumulations, for the segregated group of participating or dividend-paying policies and contracts identified as a closed block.

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