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Fair Value of Financial Instruments - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Percentage of investment portfolio fair value pricing services or index price | 87.70% | 88.60%
Net investment losses included in net income related to financial assets | $ (0.4) | $ 3.4
Net investment (gains) losses included in net income related to financial liabilities | $ (1.3) | 14.8
Fair Value Recurring Basis Unobservable Input Reconciliation Liability Gain Loss Statement Of Income Extensible List Not Disclosed Flag | true |
Carrying Value | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Separate account (variable annuity) assets | $ 3,294.1 | 2,792.3
Fair Value | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Separate account (variable annuity) assets | $ 3,294.1 | 2,792.3
Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Percentage of invested assets in total investment portfolio Level 3 recurring | 9.50% |
Fair Value, Inputs, Level 3 | Fair Value | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Separate account (variable annuity) assets | $ 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Fair Value | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Separate account (variable annuity) assets | 3,294.1 | 2,792.3
Fair Value, Inputs, Level 2 [Member] | Fair Value | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Separate account (variable annuity) assets | $ 0.0 | $ 0.0
Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Number of hard-to-value fixed maturity securities | security | 75 |
Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Number of hard-to-value fixed maturity securities | security | 125 |

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