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Fair Value Measurements - Quantitative Information about Significant Unobservable Inputs (Details) - Valuation, Market Approach - Significant Unobservable Inputs (Level 3) $ in Millions | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Other |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 32.0 | $ 26.8
Total Level 3 Fixed Maturity Investments |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 249.9 | 449.2
Investment-grade | Investment-grade |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 87.9 | 246.7
Non-investment-grade | Senior Debt |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 76.1 | 111.1
Non-investment-grade | Junior Debt |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 53.9 | $ 64.6
Measurement Input, Discount Rate | Investment-grade | Investment-grade | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.023 | 0.014
Measurement Input, Discount Rate | Investment-grade | Investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.103 | 0.130
Measurement Input, Discount Rate | Investment-grade | Investment-grade | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.054 | 0.038
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.051 | 0.024
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.202 | 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 | 0.085 | 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 | 0.275 | 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 | 0.150 | 0.137

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