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Borrowings - Schedule of Second Lien Priority on Specified Assets Carried on Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Advances, net (amounts related to VIEs of $608.4 and $587.1) $ 718.9 $ 772.4  
Mortgage servicing rights, at fair value 2,665.2 2,250.1  
Cash and cash equivalents 208.0 192.8  
Balance 12,399.2 $ 12,147.1 $ 10,651.1
Second Lien      
Debt Instrument [Line Items]      
Advances, net (amounts related to VIEs of $608.4 and $587.1) 228.1    
Deferred Servicing Income 3.7    
Mortgage servicing rights, at fair value 690.4    
Cash and cash equivalents 124.1    
Advance Facility Reserve 15.8    
Specified Loan Value 99.7    
Specified Residual Value 0.0    
Balance $ 1,161.7