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v3.20.1

Fair Value Measurements - Quantitative Information for Level 3 Inputs (Details) - Market Yield - Significant Unobservable Inputs (Level 3) $ in Millions | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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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 | 0.024 | 0.024
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.203 | 0.215
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.109 | 0.091
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.089 | 0.096
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.205 | 0.180
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.146 | 0.131
Collateralized Loan Obligations | Measurement Input, Discount Rate | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.029 | 0.032
Collateralized Loan Obligations | Measurement Input, Discount Rate | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.201 | 0.125
Collateralized Loan Obligations | Measurement Input, Discount Rate | Weighted-average Yield |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.073 | 0.051
Private Placement | Investment-grade |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 186.0 | $ 204.2
Private Placement | Measurement Input, Discount Rate | Investment-grade | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.024 | 0.024
Private Placement | Measurement Input, Discount Rate | Investment-grade | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.100 | 0.085
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 | 0.041
Senior Debt | Non-investment-grade |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 118.0 | $ 123.7
Junior Debt | Non-investment-grade |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 77.5 | 81.3
Collateralized Loan Obligations |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 77.9 | 613.5
Other |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 25.9 | 21.5
Investments in Fixed Maturities |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 485.3 | $ 1,044.2

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