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Liability for Future Policy Holder Benefits - Changes in Deferred Profit Liability (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Deferred Profit Liability [Roll Forward] |  |  |
Balance, beginning of period | $ 337.8 | $ 253.6 | $ 193.4
Annual assumption changes | 4.8 | 15.0 | (12.7)
Profits deferred | 160.7 | 163.1 | 164.7
Interest accrual | 17.1 | 13.2 | 10.4
Amortization | (110.7) | (111.2) | (101.6)
Effect of actual variances from expected experience and other changes | 2.4 | 4.1 | (0.6)
Balance, end of period | $ 412.1 | $ 337.8 | $ 253.6

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- Definition Liability For Future Policy Benefit, Before Reinsurance, Deferred Profit Liability + References No definition available. + Details
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- Definition Liability For Future Policy Benefit, Before Reinsurance, Deferred Profit Liability, Amortization + References No definition available. + Details
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- Definition Liability For Future Policy Benefit, Before Reinsurance, Deferred Profit Liability, Assumption Changes + References No definition available. + Details
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- Definition Liability For Future Policy Benefit, Before Reinsurance, Deferred Profit Liability, Effect of Actual Variance From Expected Experience and Change in Assumptions + References No definition available. + Details
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- Definition Liability For Future Policy Benefit, Before Reinsurance, Deferred Profit Liability, Interest Accrued + References No definition available. + Details
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- Definition Liability For Future Policy Benefit, Before Reinsurance, Deferred Profit Liability, Profits Deferred + References No definition available. + Details
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