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Fair Value Measurements - Quantitative Information about Significant Unobservable Inputs (Details) - Valuation, Market Approach [Member] - Fair Value, Inputs, Level 3 [Member] $ in Millions | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Collateralized Loan Obligations [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | $ 504.9 | $ 93.2
Other Debt Obligations [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | 15.9 | 13.2
Investments in Fixed Maturities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | 897.4 | 494.8
External Credit Rating, Investment Grade [Member] | Private Placement [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | 146.7 | 96.2
External Credit Rating, Non Investment Grade [Member] | Senior Debt Obligations [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | 142.3 | 138.1
External Credit Rating, Non Investment Grade [Member] | Junior Subordinated Debt [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | $ 87.6 | $ 154.1
Measurement Input, Discount Rate [Member] | External Credit Rating, Investment Grade [Member] | Private Placement [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative Investment, Measurement Input | 0.037 | 0.030
Measurement Input, Discount Rate [Member] | External Credit Rating, Investment Grade [Member] | Private Placement [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative Investment, Measurement Input | 0.109 | 0.067
Measurement Input, Discount Rate [Member] | External Credit Rating, Investment Grade [Member] | Private Placement [Member] | Weighted Average [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative Investment, Measurement Input | 0.052 | 0.038
Collateralized Loan Obligations [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt Instrument, Measurement Input | 0.041 | 0.043
Collateralized Loan Obligations [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt Instrument, Measurement Input | 0.134 | 0.106
Collateralized Loan Obligations [Member] | Measurement Input, Discount Rate [Member] | Weighted Average [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt Instrument, Measurement Input | 0.061 | 0.078
Junior Subordinated Debt [Member] | Measurement Input, Discount Rate [Member] | External Credit Rating, Non Investment Grade [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt Instrument, Measurement Input | 0.110 | 0.096
Junior Subordinated Debt [Member] | Measurement Input, Discount Rate [Member] | External Credit Rating, Non Investment Grade [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt Instrument, Measurement Input | 0.285 | 0.243
Junior Subordinated Debt [Member] | Measurement Input, Discount Rate [Member] | External Credit Rating, Non Investment Grade [Member] | Weighted Average [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt Instrument, Measurement Input | 0.142 | 0.129
Senior Debt Obligations [Member] | Measurement Input, Discount Rate [Member] | External Credit Rating, Non Investment Grade [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt Instrument, Measurement Input | 0.048 | 0.045
Senior Debt Obligations [Member] | Measurement Input, Discount Rate [Member] | External Credit Rating, Non Investment Grade [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt Instrument, Measurement Input | 0.300 | 0.157
Senior Debt Obligations [Member] | Measurement Input, Discount Rate [Member] | External Credit Rating, Non Investment Grade [Member] | Weighted Average [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt Instrument, Measurement Input | 0.115 | 0.100

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