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Borrowings - Schedule of Second Lien Priority on Specified Assets Carried on Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Debt Instrument [Line Items]      
Advances, net $ 564.6 $ 718.9  
Mortgage servicing rights (MSRs), at fair value 2,859.8 2,665.2  
Cash and cash equivalents 194.0 208.0  
Total assets 13,011.7 $ 12,399.2 $ 12,360.1
Second Lien      
Debt Instrument [Line Items]      
Advances, net 178.5    
Specified deferred servicing fee 4.1    
Mortgage servicing rights (MSRs), at fair value 674.3    
Cash and cash equivalents 123.1    
Specified advance facility reserves 11.0    
Specified loan value 69.3    
Specified residual value 0.0    
Total assets $ 1,060.3