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Future Policy Benefits and Claims - Additional Liability for Certain Benefit Features (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Changes in the additional liability for certain benefits features |  |  |  |
Balance at end of period |  | $ 5,326.5 | $ 4,095.2 |
Benefits and Protection | Life Insurance | Universal life |  |  |  |
Changes in the additional liability for certain benefits features |  |  |  |
Balance at beginning of period |  | 4,095.2 | 3,814.2 | $ 3,463.9
Effect of changes in cash flow assumptions |  | 725.4 | (6.0) | (11.1)
Effect of actual variances from expected experience |  | 45.2 | 54.9 | 18.1
Interest accrual |  | 209.2 | 171.2 | 158.3
Net assessments collected |  | 378.1 | 320.3 | 324.7
Benefit payments |  | (126.6) | (91.9) | (83.1)
Other |  | 0.0 | (167.5) | (56.6)
Balance at end of period |  | 5,326.5 | 4,095.2 | $ 3,814.2
Reinsurance impact |  | (5,306.2) | (4,091.4) |
Balance at end of period after reinsurance |  | $ 20.3 | $ 3.8 |
Weighted-average duration for additional liability (in years) |  | 26 years 2 months 12 days | 27 years 7 months 6 days |
Additional liability for certain benefit features increase (decrease) from update of actuarial assumptions | $ 725.4 |  |  |
Income before taxes, net of reinsurance decrease due to updating actuarial assumptions related to the additional liability for certain benefit features | $ 13.1 |  |  |

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- Definition Amount of increase (decrease) classified as other in present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + References No definition available. + Details
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- Definition Amount recoverable under reinsurance for present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + References No definition available. + Details
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- Definition Amount, after effect of reinsurance, of present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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- Definition Amount of cash outflow to policyholder related to benefit payment for present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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- Definition Amount of cumulative increase (decrease) in present value of total expected payment to policyholder in excess of present value of total expected assessment from effect of variance from cash flow assumption change for actual experience. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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- Definition Amount of gross premium collected from policyholder to fund expected benefit payment for present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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