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Related-Party Transactions - Other Related-Party Arrangements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fund Participants | Reo Portfolio      
Related-Party Transactions      
Aggregate commitment $ 15.0    
Capital commitments funded $ 4.9    
Additional earning increments of operating cash flows 60.00%    
Preferred return rate 5.00%    
Non-controlling interest income $ 0.2 $ 1.8 $ 1.3
Fund Participants | Reo Portfolio | Fund Participants      
Related-Party Transactions      
Ownership percentage 10.00%    
Highmark Residential      
Related-Party Transactions      
Payments to related party $ 4.2 $ 2.1 $ 1.6