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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 | Mar. 31, 2023 | Dec. 31, 2022 | Jan. 01, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Liability for future policy benefits | $ 1,772.4 | $ 1,718.0 |  |  |
Previously Reported |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Liability for future policy benefits |  |  |  |  |
Whole Life |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Liability for future policy benefits | 292.8 | 278.4 |  | $ 317.7 | $ 330.6
Effect of changes in cash flow assumptions |  | 0.0 | $ 5.2 |  | 2.8
Less: Reinsurance recoverable | (65.0) | (63.1) |  | (0.5) | (0.1)
Less: Change in discount rate assumptions |  |  |  |  | (0.2)
Net liability for future policy benefits at March 31, 2023 | 228.1 | 216.4 |  | 317.2 | 330.3
Whole Life | Previously Reported |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Liability for future policy benefits |  |  |  |  | 218.7
Whole Life | Change in discount rate assumptions |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Effect of 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] |  |  |  |  |
Effect of changes in cash flow assumptions |  |  |  |  | 0.4
Term Life |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Liability for future policy benefits | 121.2 | 112.2 |  | 117.6 | 120.5
Effect of changes in cash flow assumptions |  | 0.0 | 21.5 |  | (4.8)
Less: Reinsurance recoverable | (16.6) | (15.3) |  | (5.5) | (5.4)
Less: Change in discount rate assumptions |  |  |  |  | (0.9)
Net liability for future policy benefits at March 31, 2023 | 104.6 | 97.1 |  | 112.1 | 114.2
Term Life | Previously Reported |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Liability for future policy benefits |  |  |  |  | 93.2
Term Life | Change in discount rate assumptions |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Effect of 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] |  |  |  |  |
Effect of changes in cash flow assumptions |  |  |  |  | 0.0
Experience Life |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Liability for future policy benefits | 822.8 | 799.3 |  | 1,098.1 | 1,191.3
Effect of changes in cash flow assumptions |  | 0.0 | 11.0 |  | (3.6)
Less: Reinsurance recoverable | (0.8) | (0.8) |  | (1.1) | (1.3)
Less: Change in discount rate assumptions |  |  |  |  | (0.7)
Net liability for future policy benefits at March 31, 2023 | 822.0 | 798.5 |  | 1,097.0 | 1,189.3
Experience Life | Previously Reported |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Liability for future policy benefits |  |  |  |  | 758.3
Experience Life | Change in discount rate assumptions |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Effect of 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] |  |  |  |  |
Effect of changes in cash flow assumptions |  |  |  |  | 0.0
Limited Pay Whole Life |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Liability for future policy benefits | 53.3 | 49.6 |  | 73.2 | 69.5
Effect of changes in cash flow assumptions |  | 0.0 | 2.0 |  | 0.0
Less: Reinsurance recoverable | (0.1) | 0.0 |  | (0.2) | (0.1)
Less: Change in discount rate assumptions |  |  |  |  | (0.1)
Net liability for future policy benefits at March 31, 2023 | 53.2 | 49.6 |  | 73.0 | 69.3
Limited Pay Whole Life | Previously Reported |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Liability for future policy benefits |  |  |  |  | 51.3
Limited Pay Whole Life | Change in discount rate assumptions |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Effect of 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] |  |  |  |  |
Effect of changes in cash flow assumptions |  |  |  |  | 0.0
Supplemental Health |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Liability for future policy benefits |  |  |  |  | 415.5
Less: Reinsurance recoverable |  |  |  |  | 0.0
Less: Change in discount rate assumptions |  |  |  |  | 0.0
Net liability for future policy benefits at March 31, 2023 |  |  |  |  | 415.5
Supplemental Health | Previously Reported |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Liability for future policy benefits |  |  |  |  | 392.5
Supplemental Health | Change in discount rate assumptions |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Effect of 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] |  |  |  |  |
Effect of 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 March 31, 2023 | 101.7 | 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 March 31, 2023 | 22.2 | 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 March 31, 2023 | 23.7 | 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 March 31, 2023 | 114.0 | 114.3 |  | 160.3 | 188.8
SPIA (life contingent) |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Liability for future policy benefits | 105.9 | 103.3 |  | 124.7 | 136.5
Effect of changes in cash flow assumptions |  | 0.0 | $ 0.0 |  | 0.0
Less: Reinsurance recoverable | (3.5) | (3.2) |  | 0.0 | 0.0
Less: Change in discount rate assumptions |  |  |  |  | 0.0
Net liability for future policy benefits at March 31, 2023 | $ 102.4 | $ 100.1 |  | $ 124.7 | 136.5
SPIA (life contingent) | Previously Reported |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Liability for future policy benefits |  |  |  |  | 115.9
SPIA (life contingent) | Change in discount rate assumptions |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Effect of 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] |  |  |  |  |
Effect of changes in cash flow assumptions |  |  |  |  | $ 0.0

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