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Fair Value Measurements - Quantitative Information for Level Three Inputs (Details) - Market Yield [Member] - Fair Value, Inputs, Level 3 [Member] $ in Millions | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Collateralized Loan Obligations |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | $ 466.7 | $ 93.2
Other Debt Obligations [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | 14.5 | 13.2
Debt Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | 860.0 | 494.8
External Credit Rating, Investment Grade [Member] | Private Placement [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | 136.3 | 96.2
External Credit Rating, Non Investment Grade [Member] | Senior Debt [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | 151.6 | 138.1
External Credit Rating, Non Investment Grade [Member] | Junior Debt [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | $ 90.9 | $ 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 | 0.030 | 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 | 0.105 | 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 | 0.050 | 0.038
Collateralized Loan Obligations | Measurement Input, Discount Rate [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt Instrument, Measurement Input | 0.035 | 0.043
Collateralized Loan Obligations | Measurement Input, Discount Rate [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt Instrument, Measurement Input | 0.104 | 0.106
Collateralized Loan Obligations | Measurement Input, Discount Rate [Member] | Weighted Average [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt Instrument, Measurement Input | 0.051 | 0.078
Junior 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 | 0.095 | 0.096
Junior 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 | 0.278 | 0.243
Junior 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 | 0.130 | 0.129
Senior 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 | 0.037 | 0.045
Senior 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 | 0.233 | 0.157
Senior 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 | 0.097 | 0.100

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