v3.26.1
Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 01, 2026
Jan. 05, 2026
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning balance     $ 2,825.3 $ 2,466.3  
Sales (3)     (20.6)    
Sales (3)       0.1  
Recognized on the sale of residential mortgage loans     104.8 60.5  
Purchases of MSRs     193.5 98.3  
Servicing transfers and adjustments     (17.2) 0.0  
Changes in fair value recognized in earnings:          
Changes in valuation inputs or assumptions     12.3 (19.6)  
Realization of cash flows (2)     (72.1) (58.2)  
Ending balance     3,025.9    
Assets serviced     200,100.0   $ 191,100.0
Servicing Asset at Fair Value, Period Increase (Decrease)     (59.8)    
Servicing assets at fair value, net additions (sales) recognized     260.4    
Financing Liability Mortgage Servicing Rights Pledged [Member]          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Sales (3)     9.6 6.7  
Changes in fair value recognized in earnings:          
Unpaid Principal Balance, Mortgage Servicing Rights Sold, Subservicing Retained   $ 1,300.0      
Fair Value Agency Mortgage Servicing Rights          
Changes in fair value recognized in earnings:          
Ending balance       2,547.4  
Servicing Asset at Fair Value, Period Increase (Decrease)       (77.8)  
Servicing assets at fair value, net additions (sales) recognized       $ 158.9  
Transferred MSR, Subject To Pledged Liability          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning balance     581.0    
Changes in fair value recognized in earnings:          
Ending balance     546.6    
Assets serviced     37,200.0   38,600.0
Transferred MSR, Subject To Pledged Liability | Rithm Capital Corp          
Changes in fair value recognized in earnings:          
Assets serviced     6,900.0    
Fair Value GSE Mortgage Servicing Rights          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning balance     2,089.2    
Changes in fair value recognized in earnings:          
Ending balance     2,230.5    
Assets serviced     150,900.0   143,500.0
Fair Value GNMA Mortgage Servicing Rights          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning balance     528.6    
Changes in fair value recognized in earnings:          
Ending balance     604.9    
Assets serviced     31,800.0   28,100.0
Fair Value Non-Agency Mortgage Servicing Rights          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning balance     207.4    
Changes in fair value recognized in earnings:          
Ending balance     190.5    
Assets serviced     17,300.0   $ 19,500.0
Fair Value Non-Agency Mortgage Servicing Rights | Rithm Capital Corp          
Changes in fair value recognized in earnings:          
UPB of MSR liability $ 1,200.0        
Financing Liability Excess Servicing Spread [Member]          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning balance     373.5    
Changes in fair value recognized in earnings:          
Ending balance     $ 343.0