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Deferred Acquisition Costs and Other Actuarial Balances - Unearned Revenue Liability (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Actuarial Balances
Total unearned revenue liability	$ 504.8	$ 492.7
Universal life | Benefits and Protection | Life Insurance
Other Actuarial Balances
Total unearned revenue liability	498.7	485.5	$ 459.0
Other balances
Other Actuarial Balances
Total unearned revenue liability	$ 6.1	$ 7.2

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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.

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