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Deferred Acquisition Costs and Other Actuarial Balances - Unearned Revenue Liability Balances and Changes (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Dec. 31, 2024
Other Actuarial Balances |  |
Beginning balance, Unearned Revenue Liability | $ 515.4 |
Ending balance, Unearned Revenue Liability | 527.5 | $ 515.4
Universal life | Benefits and Protection | Life Insurance |  |
Other Actuarial Balances |  |
Beginning balance, Unearned Revenue Liability | 510.1 | 485.5
Deferrals | 28.9 | 56.1
Revenue recognized | (16.6) | (31.5)
Ending balance, Unearned Revenue Liability | 522.4 | 510.1
Reinsurance impact | (218.3) | (220.8)
Balance at end of period after reinsurance | $ 304.1 | $ 289.3

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- Definition Represents collected fees or other policyholder assessments, inclusive of cost of insurance charges, administrative charges and other similar fees, for services to be provided in future periods. + References No definition available. + Details
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- Definition Amount, after effect of reinsurance, of collected fees or other policyholder assessments, inclusive of cost of insurance charges, administrative charges and other similar fees, for services to be provided in future periods. + References No definition available. + Details
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