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Non-consolidated variable interest entities - Additional Information (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2013
Sep. 30, 2011
Variable Interest Entity        
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement $ 63.0 $ 57.0    
PRLP 2011 Holding, LLC        
Variable Interest Entity        
Equity Method Investment Ownership Percentage 24.90%     24.90%
Cash Received From Investee       $ 48.0
PR Asset Portfolio 2013-1 International, LLC        
Variable Interest Entity        
Equity Method Investment Ownership Percentage     24.90%  
Cash Received From Investee     $ 92.0  
FNMA, GNMA, FHLMC VIE        
Variable Interest Entity        
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement $ 9.9 $ 10.6