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Deferred Acquisition Costs and Other Actuarial Balances - Unearned Revenue Liability Balances and Changes (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Actuarial Balances |  |  |
Beginning balance, Unearned Revenue Liability | $ 467.4 |  |
Ending balance, Unearned Revenue Liability | 492.7 | $ 467.4 |
Benefits and Protection | Life Insurance |  |  |
Other Actuarial Balances |  |  |
Beginning balance, Unearned Revenue Liability |  |  | $ 384.4
Universal life | Benefits and Protection | Life Insurance |  |  |
Other Actuarial Balances |  |  |
Beginning balance, Unearned Revenue Liability | 459.0 | 425.3 | 384.4
Deferrals | 56.3 | 61.8 | 66.1
Revenue recognized | (29.8) | (28.1) | (25.2)
Ending balance, Unearned Revenue Liability | 485.5 | 459.0 | $ 425.3
Reinsurance impact | (225.1) | (227.9) |
Balance at end of period after reinsurance | $ 260.4 | $ 231.1 |

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