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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance $ 2,272.2 $ 2,665.2 $ 2,665.2
Servicing Asset at Fair Value, Disposals 0.0 0.0  
Recognized on the sale of residential mortgage loans 34.7 31.1  
Purchases of MSRs 27.0 25.0  
Servicing transfers and adjustments (1.3) 0.0  
Changes in fair value recognized in earnings:      
Changes in valuation inputs or assumptions 101.8 (83.6)  
Realization of cash flows (59.8) (57.1)  
Ending balance 2,374.7 2,580.6 2,272.2
Assets serviced 171,300.0   169,700.0
Servicing Asset at Fair Value, Period Increase (Decrease) 42.0 (140.7)  
Servicing assets at fair value, net additions (sales) recognized 60.4 56.0  
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)  
ESS Financing Liability      
Changes in fair value recognized in earnings:      
Realization of expected cash flows 12.5 14.5  
Derivative, Gain (Loss) on Derivative, Net (53.7) 14.1  
MSR Asset Vehicle LLC      
Changes in fair value recognized in earnings:      
UPB of MSRs sold 18.0 $ 8.0  
Fair Value Non-Agency Mortgage Servicing Rights      
Changes in fair value recognized in earnings:      
Assets serviced 23,000.0   23,800.0
Rithm Capital Corp . and others      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance 244.8    
Changes in fair value recognized in earnings:      
Ending balance 253.8   244.8
Assets serviced 18,500.0   18,100.0
Transferred MSR, Subject To Pledged Liability      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance 667.6    
Changes in fair value recognized in earnings:      
Ending balance 667.4   667.6
Assets serviced $ 46,800.0   $ 46,900.0