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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) segment | Jan. 01, 2020 USD ($) | Dec. 31, 2018 USD ($)
Accounting Policies [Abstract] |  |  |
Number of business segments | segment | 1 |  |
Capitalized financing costs | $ 24.5 |  | $ 17.6
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance reserve | 60.0 |  |
Commercial Mortgage Backed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Investment income, interest | 14.6 |  |
CMBS (Held-to-maturity Securities) |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Interest income from subordinate loans and other lending assets | 4.1 |  |
(CBMS) Fair Value Option |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Interest income from subordinate loans and other lending assets | 10.5 |  |
ASU 2016-13 |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Loan carrying value | $ 136.3 |  |
Forecast | ASU 2016-13 |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance reserve |  | $ 31.0 |
Allowance reserve as a percentage of our loan portfolio |  | 0.50% |
Carrying value of loan portfolio excluding loans with reserve |  | $ 6,200.0 |

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