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Fair Value Measurements - Quantitative Information for Level 3 Inputs (Details) - Market Yield - Significant Unobservable Inputs (Level 3) $ in Millions | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
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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 | 0.016 | 0.024
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.190 | 0.234
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.067 | 0.095
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.060 | 0.031
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.265 | 0.279
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.147 | 0.137
Private Placement | Investment-grade |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 263.7 | $ 246.7
Private Placement | Measurement Input, Discount Rate | Investment-grade | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.009 | 0.014
Private Placement | Measurement Input, Discount Rate | Investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.094 | 0.130
Private Placement | Measurement Input, Discount Rate | Investment-grade | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.032 | 0.038
Senior Debt | Non-investment-grade |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 60.3 | $ 111.1
Junior Debt | Non-investment-grade |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 68.6 | 64.6
Other |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 68.8 | 26.8
Investments in Fixed Maturities |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 461.4 | $ 449.2

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