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Borrowings - Schedule of Second Lien Priority on Specified Assets Carried on Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Advances, net (amounts related to VIEs of $573.0 and $608.4) $ 678.8 $ 718.9  
Mortgage servicing rights (MSRs), at fair value 2,272.2 2,665.2  
Cash and cash equivalents 201.6 208.0  
Balance 12,513.7 $ 12,399.2 $ 12,147.1
Second Lien      
Debt Instrument [Line Items]      
Advances, net (amounts related to VIEs of $573.0 and $608.4) 177.9    
Deferred Servicing Income 4.1    
Mortgage servicing rights (MSRs), at fair value 586.2    
Cash and cash equivalents 124.2    
Advance Facility Reserve 15.7    
Specified Loan Value 116.1    
Specified Residual Value 0.0    
Balance $ 1,024.1