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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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Mortgage Loans On Real Estate, Commercial And Consumer, Excluding Loans With Existing Reserves

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