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Derivatives - Fair Value of Derivatives in Consolidated Balance Sheets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Short-term and other investments | Short-term and other investments
Assets |  |
Derivatives, reported in Short-term and other investments | $ 19.0 | $ 6.8
FIA - embedded derivatives, reported in Policyholders' account balances |  |
Liabilities |  |
FIA - embedded derivatives, reported in Policyholders' account balances | 86.3 | 91.0
IUL - embedded derivatives, reported in Policyholders' account balances |  |
Liabilities |  |
IUL - embedded derivatives, reported in Policyholders' account balances | $ 3.6 | $ 1.2

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