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Borrowings - Schedule of Second Lien Priority on Specified Assets Carried on Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Debt Instrument [Line Items]      
Advances, net $ 602.7 $ 718.9  
Mortgage servicing rights (MSRs), at fair value 2,675.7 2,665.2  
Cash and cash equivalents 213.4 208.0  
Total assets 13,216.0 $ 12,399.2 $ 12,107.7
Second Lien      
Debt Instrument [Line Items]      
Advances, net 191.3    
Specified deferred servicing fee 4.0    
Mortgage servicing rights (MSRs), at fair value 644.6    
Cash and cash equivalents 118.5    
Specified advance facility reserves 14.6    
Specified loan value 83.2    
Specified residual value 0.0    
Total assets $ 1,056.2