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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, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Collateralized Loan Obligations |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 613.5 | $ 504.9
Other |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 21.5 | 15.9
Total Level 3 Fixed Maturity Investments in Corporate Securities |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 1,044.2 | 897.4
Investment-grade | Investment-grade |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 204.2 | 146.7
Non-investment-grade | Senior Debt |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 123.7 | 142.3
Non-investment-grade | Junior Debt |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 81.3 | $ 87.6
Measurement Input, Discount Rate | Investment-grade | Investment-grade | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.024 | 0.037
Measurement Input, Discount Rate | Investment-grade | Investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.085 | 0.109
Measurement Input, Discount Rate | Investment-grade | Investment-grade | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.041 | 0.052
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.024 | 0.048
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.215 | 0.300
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.091 | 0.115
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.096 | 0.110
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.180 | 0.285
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.131 | 0.142
Collateralized Loan Obligations | Measurement Input, Discount Rate | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.032 | 0.041
Collateralized Loan Obligations | Measurement Input, Discount Rate | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.125 | 0.134
Collateralized Loan Obligations | Measurement Input, Discount Rate | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.051 | 0.061

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