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Borrowings - Schedule of Second Lien Priority on Specified Assets Carried on Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Debt Instrument [Line Items]      
Advances, net $ 656.9 $ 718.9  
Mortgage servicing rights (MSRs), at fair value 2,580.6 2,665.2  
Cash and cash equivalents 216.6 208.0  
Total assets 12,627.0 $ 12,399.2 $ 12,297.8
Second Lien      
Debt Instrument [Line Items]      
Advances, net 203.9    
Specified deferred servicing fee 4.4    
Mortgage servicing rights (MSRs), at fair value 632.7    
Cash and cash equivalents 124.1    
Specified advance facility reserves 15.9    
Specified loan value 108.8    
Specified residual value 0.0    
Total assets $ 1,089.8