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MSR Valuation Allowance, Net (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Assets that Continue to be Recognized, Securitized or Asset-Backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]        
MSRs, at fair value $ 2,374.7 $ 2,580.6 $ 2,272.2 $ 2,665.2
Servicing Asset at Fair Value, Period Increase (Decrease) 42.0 (140.7)    
Derivative, Gain (Loss) on Derivative, Net 49.3 (3.5)    
MSR valuation adjustments, net (11.6) (69.0)    
Total MSR Reserve Fair Value Gains (Losses) 42.0 (140.5)    
Other financing liabilities, at fair value ($402.7 and $409.2 due to related party) ($5.5 and $5.6 related to VIEs) 906.8   900.0  
MSR        
Assets that Continue to be Recognized, Securitized or Asset-Backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]        
MSRs, at fair value 2,400.0      
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]        
Other financing liabilities, at fair value ($402.7 and $409.2 due to related party) ($5.5 and $5.6 related to VIEs) 253.4   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 647.9 883.2 $ 645.5 $ 931.7
Derivative, Gain (Loss) on Derivative, Net (53.7) 14.1    
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) (4.7) (52.8)    
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 $ (4.5) $ 4.7