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MSR Valuation Allowance, Net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Assets that Continue to be Recognized, Securitized or Asset-Backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]        
Servicing Asset at Fair Value, Amount $ 2,272.2 $ 2,665.2 $ 2,250.1  
Servicing Asset at Fair Value, Period Increase (Decrease) (231.7) 178.5 (100.7)  
Derivative, Gain (Loss) on Derivative, Net 8.2 23.5 13.3  
MSR valuation adjustments, net (232.2) (10.4) (98.5)  
Total MSR Reserve Fair Value Gains (Losses) 0.8 (2.0) 0.3  
Other financing liabilities, at fair value ($409.2 and $329.8 due to related party) ($5.6 and $6.7 related to VIEs) 900.0 1,137.4    
MSR Valuation Adjustment, Fair Value In Excess Of Pledged MSR Liability   3.1    
MSR        
Assets that Continue to be Recognized, Securitized or Asset-Backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]        
Servicing Asset at Fair Value, Amount 2,272.2 2,665.2    
Financing Liability Excess Servicing Spread        
Assets that Continue to be Recognized, Securitized or Asset-Backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]        
Other financing liabilities, at fair value ($409.2 and $329.8 due to related party) ($5.6 and $6.7 related to VIEs) 248.9 199.0    
ESS Financing Liability        
Assets that Continue to be Recognized, Securitized or Asset-Backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]        
Financing Liability At Fair Value 645.5 931.7 797.1 $ 567.0
Total Fair value changes in Servicing liability at fair value $ 12.9 $ (88.0) $ 11.4