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v3.25.3

Fair Value Measurements - Quantitative Information for Level 3 Inputs (Details) - Market Yield - Significant Unobservable Inputs (Level 3) $ in Millions | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.066 | 0.070
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.261 | 0.241
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.101 | 0.100
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.085 | 0.095
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.260 | 0.310
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.130 | 0.132
Investment-grade | Investment grade |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | $ 91.6 | $ 59.9
Investment-grade | Measurement Input, Discount Rate | Investment grade | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.016 | 0.034
Investment-grade | Measurement Input, Discount Rate | Investment grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.105 | 0.116
Investment-grade | Measurement Input, Discount Rate | Investment grade | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.073 | 0.079
Senior Debt | Non-investment-grade |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | $ 116.7 | $ 42.7
Junior Debt | Non-investment-grade |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | 27.1 | 35.7
Other |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | 94.6 | 66.9
Investments in Fixed Maturities |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | $ 330.0 | $ 205.2

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