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Nature of Operations and Significant Accounting Policies - Balances and changes in Additional Liability for Certain Benefit Features (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Changes in the additional liability for certain benefits features |  |  |
Balance at end of period | $ 4,219.3 | $ 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 |  | (6.0) | (11.1)
Effect of actual variances from expected experience | 15.1 | 54.9 | 18.1
Interest accrual | 46.3 | 171.2 | 158.3
Net assessments collected | 89.2 | 320.3 | 324.7
Benefit payments | (26.5) | (91.9) | (83.1)
Other |  | (167.5) | (56.6)
Balance at end of period | $ 4,219.3 | $ 4,095.2 | $ 3,814.2

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