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Fair Value of Financial Instruments - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Percentage of investment portfolio fair value pricing services or index price | 88.60% | 90.20%
Net investment losses included in net income related to financial assets | $ | $ 3.4 | $ 8.1
Net investment (gains) losses included in net income related to financial liabilities | $ | $ 12.9 | $ (10.0)
Fair Value Recurring Basis Unobservable Input Reconciliation Liability Gain Loss Statement Of Income Extensible List Not Disclosed Flag | true |
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 | 7.80% |
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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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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