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Borrowings - Schedule of Second Lien Priority on Specified Assets Carried on Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Advances, net $ 602.7 $ 678.8
Mortgage servicing rights (MSRs), at fair value 2,374.7 2,272.2
Cash and cash equivalents 185.1 201.6
Total assets 13,090.1 $ 12,513.7
Second Lien    
Debt Instrument [Line Items]    
Advances, net 167.3  
Specified deferred servicing fee 4.2  
Mortgage servicing rights (MSRs), at fair value 631.6  
Cash and cash equivalents 111.1  
Specified advance facility reserves 11.7  
Specified loan value 79.6  
Specified residual value 0.0  
Total assets $ 1,005.5