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Closed Block - Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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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 | 2,982.9 | 3,128.1 |  |
Closed Block liabilities: Other policyholder funds | 5.1 | 5.1 |  |
Closed Block liabilities: Policyholder dividends payable | 157.2 | 168.2 |  |
Closed Block liabilities: Policyholder dividend obligation | 0.0 | 0.0 |  |
Closed Block liabilities: Income taxes currently payable | 4.0 |  |  |
Closed Block liabilities: Other liabilities | 23.2 | 24.9 |  |
Total Closed Block liabilities | 3,172.4 | 3,326.3 |  |
Assets designated to the Closed Block |  |  |  |
Closed Block assets: Fixed maturities, available-for-sale | 1,766.7 | 1,690.2 |  |
Closed Block assets: Fixed maturities, trading | 2.0 | 2.0 |  |
Closed Block assets: Equity securities | 0.9 | 0.8 |  |
Closed Block assets: Mortgage loans | 469.5 | 544.9 |  |
Closed Block assets: Policy loans | 379.9 | 407.4 |  |
Closed Block assets: Other investments | 61.2 | 62.2 |  |
Closed Block assets: Total investments | 2,680.2 | 2,707.5 |  |
Closed Block assets: Cash and cash equivalents | 6.1 | 62.0 |  |
Closed Block assets: Accrued investment income | 32.6 | 30.3 |  |
Closed Block assets: Reinsurance recoverable and deposit receivable | 3.5 | 3.9 |  |
Closed Block assets: Premiums due and other receivables | 3.4 | 4.1 |  |
Closed Block assets: Deferred tax asset | 52.1 | 62.0 |  |
Closed Block assets: Other assets | 5.3 | 0.1 |  |
Total assets designated to the Closed Block | 2,783.2 | 2,869.9 |  |
Excess of Closed Block liabilities over assets designated to the Closed Block | 389.2 | 456.4 |  |
Amounts included in accumulated other comprehensive income (loss) | (69.6) | (111.9) |  |
Maximum future earnings to be recognized from Closed Block assets and liabilities | $ 319.6 | $ 344.5 | $ 379.2 | $ 393.5

X
- 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. + References No definition available. + Details
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- Definition Amount of current income taxes payable under closed block liabilities as of balance sheet date. + References No definition available. + Details
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- Definition 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. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition Amount of accrued investment income held by the closed block. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition 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. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition Amount, after valuation allowance and deferred tax liability, of deferred tax asset pertaining to the closed block. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition Fair value of equity securities allocated to the segregated group of participating or dividend-paying policies and contracts identified as the closed block. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition 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. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition Amount of investments held by the closed block. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition 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. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition Amount of other assets held by the closed block. Excludes other investments. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition Amount of other investments held by the closed block. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition 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. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition Amount, after the allowance for doubtful accounts, of premium and other receivables held by the closed block. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition Amount of investments in debt securities classified as trading that are held by the closed block. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 805 -Name Accounting Standards Codification -Section 55 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479805/944-805-55-4 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 805 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b)(10) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- 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//1943274/2147479805/944-805-55-4 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//1943274/2147479835/944-805-50-3 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition 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. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition Amount of liabilities allocated to the closed block, classified as other. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition Amount of closed block policyholder funds held, which are refundable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 805 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition The liability as of the balance sheet date for the excess of the cumulative actual closed block earnings over the cumulative expected (actuarially determined) closed block earnings (each) for the period from the actuarial calculation date to the date of measurement. The excess will result in future dividends to closed block policyholders, unless offset by less favorable than expected future performance of the closed block. The policyholder dividend obligation, which may not have a negative balance, recognizes that a portion of earnings in certain cases will not inure to the stockholders of the insurance entity. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition Amount of dividends payable as of the balance sheet date to policyholders of contracts in the closed block. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b)(8) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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- Definition The difference between the liabilities of and the assets allocated to the segregated group of participating or dividend-paying policies and contracts identified as the closed block. + 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//1943274/2147479805/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479835/944-805-50-3 + Details
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