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Related Party Arrangements - Origination of Mezzanine Loan (Narrative) (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($)
$ in Millions
Dec. 31, 2020
Jul. 31, 2015
Related Party Transaction [Line Items]    
VIE carrying value $ 229.2  
Mezzanine loans    
Related Party Transaction [Line Items]    
VIE carrying value   $ 75.0