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Fair Value Measurements - Quantitative Information for Level 3 Inputs (Details) - Market Yield - Significant Unobservable Inputs (Level 3) $ in Millions | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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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 | 0.027 | 0.048
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.199 | 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 | 0.098 | 0.115
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.099 | 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 | 0.037 | 0.041
Collateralized Loan Obligations | Measurement Input, Discount Rate | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.126 | 0.134
Collateralized Loan Obligations | Measurement Input, Discount Rate | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.054 | 0.061
Private Placement | Investment-grade |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 249.8 | $ 146.7
Private Placement | Measurement Input, Discount Rate | Investment-grade | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.025 | 0.037
Private Placement | Measurement Input, Discount Rate | Investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.102 | 0.109
Private Placement | Measurement Input, Discount Rate | Investment-grade | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.043 | 0.052
Senior Debt | Non-investment-grade |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 117.5 | $ 142.3
Junior Debt | Non-investment-grade |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 82.4 | 87.6
Collateralized Loan Obligations |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 536.5 | 504.9
Other |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 8.6 | 15.9
Investments in Fixed Maturities |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 994.8 | $ 897.4

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