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MSR Valuation Allowance, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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 $ 2,466.3 $ 2,272.2 $ 2,665.2 $ 2,250.1
Other financing liabilities, at fair value ($322.7 and $409.2 due to related party) ($0.0 and $5.6 related to VIEs) 846.9 900.0    
Total MSR Reserve Fair Value Gains (Losses) (5.0) 231.7 (178.5)  
Derivative, Gain (Loss) on Derivative, Net 82.5 8.2 23.5  
MSR valuation adjustments, net (96.2) (232.2) (10.4)  
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 2,466.3 2,272.2    
Total MSR Reserve Fair Value Gains (Losses) 5.0 (230.8) 176.4  
Servicing Asset at Fair Value, Change In Fair Value Due To Realization Of Expected Cash Flows (156.6) (143.6) (164.5)  
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions 60.5 (88.6) 154.1  
Derivative Fair Value Gain (Loss) MSR Hedge        
Assets that Continue to be Recognized, Securitized or Asset-Backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]        
Derivative, Gain (Loss) on Derivative, Net (112.9) (33.1) (106.9)  
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 ($322.7 and $409.2 due to related party) ($0.0 and $5.6 related to VIEs) 263.3 248.9    
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 583.5 645.5 931.7 $ 797.1
Total Fair value changes in Servicing liability at fair value 2.4 12.9 (88.0)  
Pledged MSR Liabilities        
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, Period Increase (Decrease) (2.4) (12.9) 88.0  
ESS Financing Liabilities        
Assets that Continue to be Recognized, Securitized or Asset-Backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]        
Total Fair value changes in Servicing liability at fair value $ 9.3 $ 18.9 $ 8.0