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Long-Duration Insurance Contracts - Balances of and Changes in the LFPB (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Liability for Future Policy Benefit, before Reinsurance | $ 1,702.1 |  | $ 1,761.8 |
Whole Life Insurance |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Beginning balance | 223.2 |  |  |
Beginning period (including reserves) |  |  |  | $ 215.1
Beginning balance at original discount rate | 247.1 |  |  |
Beginning balance at original discount rate (including reserves) |  | $ 245.9 |  |
Change in cash flow assumptions |  |  | 0.0 | 0.0
Actual variances from expected experience |  |  | 0.3 | 3.8
Adjusted balance |  |  | 247.4 | 249.7
Issuances | 2.5 | 10.8 |  |
Interest accruals | 1.9 | 7.2 |  |
Net premiums collected | (7.8) | (20.6) |  |
Ending balance at original discount rate | 244.0 |  |  |
Effect of changes in discount rate assumptions | (28.5) |  | (23.9) |
Ending balance | 215.5 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Beginning balance | 522.0 |  |  |
Beginning balance (including reserves) |  | 493.6 |  |
Beginning balance at original discount rate | 592.0 |  | 592.1 |
Beginning balance at original discount rate (including reserves) |  | 581.9 |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  | 0.0 | (0.6)
Actual variances from expected experience |  |  | 0.5 | 4.0
Adjusted balance |  |  | 592.6 | 585.3
Issuances | 2.5 | 10.7 |  |
Interest accruals | 4.8 | 19.0 |  |
Benefit payments | (7.9) | (22.9) |  |
Ending balance at original discount rate | 592.0 |  |  |
Effect of changes in discount rate assumptions | (88.2) |  | (70.1) |
Ending balance | 503.8 |  |  |
Liability for Future Policy Benefit, before Reinsurance | 288.3 |  | 298.8 |
Less: Reinsurance recoverable | (62.5) |  | (64.3) |
Net liability for future policy benefits, after reinsurance recoverable | 225.8 |  | 234.5 |
Impact of flooring on net liability for future policy benefits | 0.0 |  | 0.0 |
Net liability for future policy benefits at March 31, 2024 | 225.8 |  | 234.5 |
Term Life Insurance |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Beginning balance | 240.0 |  |  |
Beginning period (including reserves) |  |  |  | 234.7
Beginning balance at original discount rate | 256.6 |  |  |
Beginning balance at original discount rate (including reserves) |  | 265.4 |  |
Change in cash flow assumptions |  |  | 0.0 | (16.8)
Actual variances from expected experience |  |  | 0.3 | (2.7)
Adjusted balance |  |  | 256.9 | 245.9
Issuances | 6.1 | 25.2 |  |
Interest accruals | 2.6 | 10.3 |  |
Net premiums collected | (6.2) | (24.8) |  |
Ending balance at original discount rate | 259.4 |  |  |
Effect of changes in discount rate assumptions | (21.7) |  | (16.6) |
Ending balance | 237.7 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Beginning balance | 370.1 |  |  |
Beginning balance (including reserves) |  | 347.0 |  |
Beginning balance at original discount rate | 411.1 |  | 405.4 |
Beginning balance at original discount rate (including reserves) |  | 401.0 |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  | 0.0 | (16.7)
Actual variances from expected experience |  |  | 1.0 | 1.3
Adjusted balance |  |  | 406.4 | 385.6
Issuances | 6.2 | 25.8 |  |
Interest accruals | 3.9 | 15.2 |  |
Benefit payments | (5.4) | (21.2) |  |
Ending balance at original discount rate | 411.1 |  |  |
Effect of changes in discount rate assumptions | (45.0) |  | (35.3) |
Ending balance | 366.1 |  |  |
Liability for Future Policy Benefit, before Reinsurance | 128.3 |  | 130.2 |
Less: Reinsurance recoverable | (19.0) |  | (19.1) |
Net liability for future policy benefits, after reinsurance recoverable | 109.3 |  | 111.1 |
Impact of flooring on net liability for future policy benefits | 0.0 |  | 0.0 |
Net liability for future policy benefits at March 31, 2024 | 109.3 |  | 111.1 |
Experience Life Insurance |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Beginning balance | 71.7 |  |  |
Beginning period (including reserves) |  |  |  | 68.3
Beginning balance at original discount rate | 67.0 |  |  |
Beginning balance at original discount rate (including reserves) |  | 65.5 |  |
Change in cash flow assumptions |  |  | 0.0 | 3.7
Actual variances from expected experience |  |  | (0.1) | 0.7
Adjusted balance |  |  | 66.9 | 69.9
Issuances | 0.0 | 0.0 |  |
Interest accruals | 0.9 | 3.7 |  |
Net premiums collected | (1.7) | (6.6) |  |
Ending balance at original discount rate | 66.1 |  |  |
Effect of changes in discount rate assumptions | 2.9 |  | 4.7 |
Ending balance | 69.0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Beginning balance | 883.0 |  |  |
Beginning balance (including reserves) |  | 867.5 |  |
Beginning balance at original discount rate | 791.7 |  | 797.5 |
Beginning balance at original discount rate (including reserves) |  | 805.2 |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  | 0.0 | 5.0
Actual variances from expected experience |  |  | 0.0 | 1.1
Adjusted balance |  |  | 797.5 | 811.3
Issuances | 0.0 | 0.0 |  |
Interest accruals | 11.8 | 47.4 |  |
Benefit payments | (17.6) | (61.2) |  |
Ending balance at original discount rate | 791.7 |  |  |
Effect of changes in discount rate assumptions | 57.9 |  | 85.5 |
Ending balance | 849.6 |  |  |
Liability for Future Policy Benefit, before Reinsurance | 780.6 |  | 811.3 |
Less: Reinsurance recoverable | (1.1) |  | (1.0) |
Net liability for future policy benefits, after reinsurance recoverable | 779.5 |  | 810.3 |
Impact of flooring on net liability for future policy benefits | 0.0 |  | 0.0 |
Net liability for future policy benefits at March 31, 2024 | 779.5 |  | 810.3 |
Limited Pay Whole Life Insurance |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Beginning balance | 32.2 |  |  |
Beginning period (including reserves) |  |  |  | 29.7
Beginning balance at original discount rate | 33.9 |  |  |
Beginning balance at original discount rate (including reserves) |  | 32.4 |  |
Change in cash flow assumptions |  |  | 0.0 | (0.2)
Actual variances from expected experience |  |  | 0.2 | 1.0
Adjusted balance |  |  | 34.1 | 33.2
Issuances | 1.0 | 4.3 |  |
Interest accruals | 0.3 | 1.2 |  |
Net premiums collected | (1.2) | (4.8) |  |
Ending balance at original discount rate | 34.2 |  |  |
Effect of changes in discount rate assumptions | (2.3) |  | (1.7) |
Ending balance | 31.9 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Beginning balance | 89.6 |  |  |
Beginning balance (including reserves) |  | 79.4 |  |
Beginning balance at original discount rate | 107.3 |  | 105.6 |
Beginning balance at original discount rate (including reserves) |  | 98.6 |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  | 0.0 | (0.2)
Actual variances from expected experience |  |  | 0.1 | 1.0
Adjusted balance |  |  | 105.7 | 99.4
Issuances | 1.0 | 4.3 |  |
Interest accruals | 1.0 | 3.9 |  |
Benefit payments | (0.4) | (2.0) |  |
Ending balance at original discount rate | 107.3 |  |  |
Effect of changes in discount rate assumptions | (20.1) |  | (16.0) |
Ending balance | 87.2 |  |  |
Liability for Future Policy Benefit, before Reinsurance | 55.3 |  | 57.4 |
Less: Reinsurance recoverable | (1.1) |  | (1.2) |
Net liability for future policy benefits, after reinsurance recoverable | 54.2 |  | 56.2 |
Impact of flooring on net liability for future policy benefits | 0.0 |  | 0.0 |
Net liability for future policy benefits at March 31, 2024 | 54.2 |  | 56.2 |
Supplemental health |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Beginning balance | 182.0 |  |  |
Beginning period (including reserves) |  |  |  | 167.4
Beginning balance at original discount rate | 213.4 |  |  |
Beginning balance at original discount rate (including reserves) |  | 205.1 |  |
Change in cash flow assumptions |  |  | 0.0 | 6.5
Actual variances from expected experience |  |  | 0.2 | (1.6)
Adjusted balance |  |  | 213.6 | 210.0
Issuances | 5.6 | 19.4 |  |
Interest accruals | 1.6 | 6.0 |  |
Net premiums collected | (6.2) | (22.0) |  |
Ending balance at original discount rate | 214.6 |  |  |
Effect of changes in discount rate assumptions | (35.1) |  | (31.4) |
Ending balance | 179.5 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Beginning balance | 427.6 |  |  |
Beginning balance (including reserves) |  | 431.7 |  |
Beginning balance at original discount rate | 510.5 |  | 517.9 |
Beginning balance at original discount rate (including reserves) |  | 537.1 |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  | 0.0 | 8.9
Actual variances from expected experience |  |  | 0.1 | (2.4)
Adjusted balance |  |  | 518.0 | 543.6
Issuances | 5.6 | 19.4 |  |
Interest accruals | 3.6 | 14.4 |  |
Benefit payments | (16.7) | (59.5) |  |
Ending balance at original discount rate | 510.5 |  |  |
Effect of changes in discount rate assumptions | (98.9) |  | (90.3) |
Ending balance | 411.6 |  |  |
Liability for Future Policy Benefit, before Reinsurance | 231.8 |  | 245.6 |
Less: Reinsurance recoverable | (3.8) |  | (4.0) |
Net liability for future policy benefits, after reinsurance recoverable | 228.0 |  | 241.6 |
Impact of flooring on net liability for future policy benefits | 0.0 |  | 0.0 |
Net liability for future policy benefits at March 31, 2024 | 228.0 |  | 241.6 |
Cancer |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Net liability for future policy benefits at March 31, 2024 | 113.1 |  | 92.7 |
Accident |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Net liability for future policy benefits at March 31, 2024 | 20.7 |  | 21.4 |
Disability |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Net liability for future policy benefits at March 31, 2024 | 26.5 |  | 23.5 |
Other |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Net liability for future policy benefits at March 31, 2024 | 122.6 |  | 104.0 |
Life Contingent SPIA Retirement Insurance |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Beginning balance | 0.0 |  |  |
Beginning period (including reserves) |  |  |  | 0.0
Beginning balance at original discount rate | 0.0 |  |  |
Beginning balance at original discount rate (including reserves) |  | 0.0 |  |
Change in cash flow assumptions |  |  | 0.0 | 0.0
Actual variances from expected experience |  |  | 0.0 | 0.0
Adjusted balance |  |  | 0.0 | 0.0
Issuances | 0.6 | 5.6 |  |
Interest accruals | 0.0 | 0.0 |  |
Net premiums collected | (0.6) | (5.6) |  |
Ending balance at original discount rate | 0.0 |  |  |
Effect of changes in discount rate assumptions | 0.0 |  | 0.0 |
Ending balance | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Beginning balance | 104.2 |  |  |
Beginning balance (including reserves) |  | 103.3 |  |
Beginning balance at original discount rate | 110.3 |  | 111.4 |
Beginning balance at original discount rate (including reserves) |  | 113.4 |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  | 0.0 | 0.0
Actual variances from expected experience |  |  | 0.3 | (0.8)
Adjusted balance |  |  | 111.7 | $ 112.6
Issuances | 0.6 | 6.3 |  |
Interest accruals | 1.1 | 4.4 |  |
Benefit payments | (3.1) | $ (11.9) |  |
Ending balance at original discount rate | 110.3 |  |  |
Effect of changes in discount rate assumptions | (9.0) |  | (7.2) |
Ending balance | 101.3 |  |  |
Liability for Future Policy Benefit, before Reinsurance | 101.3 |  | 104.2 |
Less: Reinsurance recoverable | (3.5) |  | (3.6) |
Net liability for future policy benefits, after reinsurance recoverable | 97.8 |  | 100.6 |
Impact of flooring on net liability for future policy benefits | 0.0 |  | 0.0 |
Net liability for future policy benefits at March 31, 2024 | $ 97.8 |  | $ 100.6 |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 4: 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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