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Mortgage Servicing - Summary of Activity Related to Fair Value Servicing Assets (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance $ 2,665.2 $ 2,250.1  
Servicing assets at fair value, net additions recognized $ (161.3) $ 236.6 $ 1,056.0
ServicingAssetAtFairValueOtherChangeInFairValueStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag Realization of cash flows Realization of cash flows Realization of cash flows
Ending balance $ 2,272.2 $ 2,665.2 $ 2,250.1
Servicing Asset at Fair Value, Period Increase (Decrease) $ (231.7) $ 178.5 (100.7)
Financing Receivable, Percent Past Due 7.50% 11.10%  
Derivative, Gain (Loss) on Derivative, Net $ 8.2 $ 23.5 13.3
MSR valuation adjustments, net $ (232.2) $ (10.4) (98.5)
Amount 169,700.0 199,600.0  
Total MSR Reserve Fair Value Gains (Losses) $ 0.8 $ (2.0) 0.3
ESS Financing Liability      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Changes in fair value 51.3 192.1 77.9
Runoff and Settlements 64.2 104.1 89.4
Total Fair value changes in Servicing liability at fair value $ 12.9 $ (88.0) $ 11.4
Financial Asset, 30 to 59 Days Past Due      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 3.70% 4.80%  
Financial Asset, 60 to 89 Days Past Due      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 1.20% 1.80%  
Financial Asset, Equal to or Greater than 90 Days Past Due      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 2.60% 4.50%  
Fair Value Non Agency Mortgage Servicing Rights      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 21.20% 20.40%  
Amount 23,800.0 62,000.0  
Fair Value Non Agency Mortgage Servicing Rights | MAV Asset Vehicle LLC      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Servicing Asset At Fair Value, Amount, Derecognition $ (421.7)    
Fair Value Non Agency Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 9.40% 8.50%  
Fair Value Non Agency Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 3.60% 3.30%  
Fair Value Non Agency Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 8.20% 8.60%  
Fair Value GSE Mortgage Servicing Rights      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 1.90% 1.60%  
Amount 127,300.0 124,500.0  
Fair Value GSE Mortgage Servicing Rights | MAV Asset Vehicle LLC      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Servicing transfers and adjustments   $ (39.0)  
Servicing Asset At Fair Value, Amount, Derecognition $ (32.5)    
Fair Value GSE Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 1.20% 0.90%  
Fair Value GSE Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 0.20% 0.20%  
Fair Value GSE Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 0.50% 0.50%  
Rithm and Other Transferred MSRs      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance $ 601.2    
Ending balance $ 244.8 $ 601.2  
Amount 18,100.0 47,300.0  
MAV Transferred Mortgage Servicing Rights      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance $ 353.4    
Ending balance $ 422.8 $ 353.4  
Amount 28,800.0 26,100.0  
Transferred MSR, Subject To Pledged Liability      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance $ 954.6    
Ending balance $ 667.6 $ 954.6  
Amount 46,900.0 73,400.0  
MSR      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance $ 2,665.2    
Ending balance $ 2,272.2 $ 2,665.2  
Amount 169,700.0 199,600.0  
Fair Value of GNMA Mortgage Servicing Rights      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 11.80% 13.20%  
Amount 18,600.0 13,100.0  
Fair Value of GNMA Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 6.10% 6.40%  
Fair Value of GNMA Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 2.00% 2.20%  
Fair Value of GNMA Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Financing Receivable, Percent Past Due 3.70% 4.60%