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Nature of Operations and Significant Accounting Policies - Balances and changes in the unearned revenue liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in unearned revenue liability
Beginning balance, Unearned Revenue Liability	$ 467.4
Ending balance, Unearned Revenue Liability	492.7	$ 467.4
Benefits and Protection | Life Insurance
Change in unearned revenue liability
Beginning balance, Unearned Revenue Liability			$ 384.4
Benefits and Protection | Life Insurance | Universal life
Change in unearned revenue liability
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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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- Definition

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

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No definition available.

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- Definition

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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No definition available.

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- Details

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