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Deferred Acquisition Costs and Other Actuarial Balances - Unearned Revenue Liability Balances and Changes (Details) - USD ($) $ in Millions	12 Months Ended
	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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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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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.

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Amount of deferred revenue in current period for services to be provided in future periods.

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Amount of the unearned revenue liability that is reinsured to another entity.

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Amount of revenue recognized that was previously included in balance of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

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