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Basis of Presentation and Significant Accounting Policies - Schedule of Changes in LFPB due to Adoption of ASU 2018-12 (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Whole Life |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  | $ (0.6) | $ 5.2 | $ 2.8
Less: Reinsurance recoverable | $ (64.3) | (63.1) | (0.5) | (0.1)
Less: Change in discount rate assumptions |  |  |  | (0.2)
Net liability for future policy benefits at September 30, 2023 | 234.5 | 216.4 | 317.2 | 330.3
Whole Life | Change in discount rate assumptions |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  |  |  | 111.5
Whole Life | Change in cash flow assumptions, effect of net premiums exceeding gross premiums |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  |  |  | 0.4
Term Life |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  | (16.7) | 21.5 | (4.8)
Less: Reinsurance recoverable | (19.1) | (15.3) | (5.5) | (5.4)
Less: Change in discount rate assumptions |  |  |  | (0.9)
Net liability for future policy benefits at September 30, 2023 | 111.1 | 97.1 | 112.1 | 114.2
Term Life | Change in discount rate assumptions |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  |  |  | 27.3
Term Life | Change in cash flow assumptions, effect of net premiums exceeding gross premiums |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  |  |  | 0.0
Experience life |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  | 5.0 | 11.0 | (3.6)
Less: Reinsurance recoverable | (1.0) | (0.8) | (1.1) | (1.3)
Less: Change in discount rate assumptions |  |  |  | (0.7)
Net liability for future policy benefits at September 30, 2023 | 810.3 | 798.5 | 1,097.0 | 1,189.3
Experience life | Change in discount rate assumptions |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  |  |  | 433.0
Experience life | Change in cash flow assumptions, effect of net premiums exceeding gross premiums |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  |  |  | 0.0
Limited-pay whole life |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  | (0.2) | 2.0 | 0.0
Less: Reinsurance recoverable | (1.2) | 0.0 | (0.2) | (0.1)
Less: Change in discount rate assumptions |  |  |  | (0.1)
Net liability for future policy benefits at September 30, 2023 | 56.2 | 49.6 | 73.0 | 69.3
Limited-pay whole life | Change in discount rate assumptions |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  |  |  | 18.2
Limited-pay whole life | Change in cash flow assumptions, effect of net premiums exceeding gross premiums |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  |  |  | 0.0
Supplemental health |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  | 8.9 | 13.8 | (3.0)
Less: Reinsurance recoverable | (4.0) | (3.4) | 0.0 | 0.0
Less: Change in discount rate assumptions |  |  |  | 0.0
Net liability for future policy benefits at September 30, 2023 | 241.6 | 261.0 | 359.1 | 415.5
Supplemental health | Change in discount rate assumptions |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  |  |  | 23.0
Supplemental health | Change in cash flow assumptions, effect of net premiums exceeding gross premiums |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  |  |  | 0.0
Cancer |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Net liability for future policy benefits at September 30, 2023 | 92.7 | 101.8 | 140.8 | 163.5
Accident |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Net liability for future policy benefits at September 30, 2023 | 21.4 | 21.8 | 28.7 | 31.2
Disability |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Net liability for future policy benefits at September 30, 2023 | 23.5 | 23.1 | 29.3 | 32.0
Other |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Net liability for future policy benefits at September 30, 2023 | 104.0 | 114.3 | 160.3 | 188.8
SPIA (life contingent) |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  | 0.0 | 0.0 | 0.0
Less: Reinsurance recoverable | (3.6) | (3.2) | 0.0 | 0.0
Less: Change in discount rate assumptions |  |  |  | 0.0
Net liability for future policy benefits at September 30, 2023 | $ 100.6 | $ 100.1 | $ 124.7 | 136.5
SPIA (life contingent) | Change in discount rate assumptions |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  |  |  | 20.6
SPIA (life contingent) | Change in cash flow assumptions, effect of net premiums exceeding gross premiums |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Changes in cash flow assumptions |  |  |  | $ 0.0

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