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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
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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. + References No definition available. + Details
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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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- Details
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