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Fair Value - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments and Nonfinancial Assets Measured at Fair Value on a Recurring or Non-recurring basis or Disclosed, but not Carried, at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financial assets:        
Mortgages Held-for-sale, Fair Value Disclosure $ 1,290.2 $ 674.2    
Financial liabilities:        
Advance match funded liabilities ($416.5 and $498.9 related to VIEs) 417.1 499.7    
Financing liabilities, at fair value:        
HMBS-related borrowings 10,872.1 7,797.3 $ 7,326.8 $ 6,885.0
Other financing liabilities 846.9 900.0    
Secured Debt [Abstract]        
Long-term Line of Credit 957.9 916.2    
Senior notes:        
Senior Notes 487.4 595.8    
Mortgage Service Rights        
MSRs 2,466.3 2,272.2 $ 2,665.2 $ 2,250.1
Carrying Value        
Financial assets:        
Mortgages Held-for-sale, Fair Value Disclosure 1,290.2 677.3    
Senior notes:        
Senior Notes 487.4 595.8    
Fair Value        
Financial assets:        
Mortgages Held-for-sale, Fair Value Disclosure 1,290.2 677.3    
Senior notes:        
Senior Notes 495.0 556.5    
Level 3 | Carrying Value        
Financial assets:        
Loans held for investment 11,125.3 7,975.5    
Advances (including match funded) 577.2 678.8    
Receivables, net 176.4 154.8    
Financial liabilities:        
Advance match funded liabilities ($416.5 and $498.9 related to VIEs) 417.1 499.7    
Financing liabilities, at fair value:        
HMBS-related borrowings 10,872.1 7,797.3    
Other financing liabilities 846.9 900.0    
Secured Debt [Abstract]        
Other 1,528.2 710.6    
Long-term Line of Credit 957.9 916.2    
Mortgage Service Rights        
MSRs 2,466.3 2,272.2    
Level 3 | Carrying Value | Interest Rate Contract        
Derivative financial instrument assets (liabilities), at fair value        
Derivative assets (liabilities) (0.5) 5.6    
Level 3 | Carrying Value | Loans Held for Investments - Restricted for Securitization Investors        
Financial assets:        
Loans held for investment 0.0 5.6    
Level 3 | Fair Value        
Financial assets:        
Loans held for investment 11,125.3 7,975.5    
Advances (including match funded) 577.2 678.8    
Receivables, net 176.4 154.8    
Financial liabilities:        
Advance match funded liabilities ($416.5 and $498.9 related to VIEs) 417.1 499.7    
Financing liabilities, at fair value:        
HMBS-related borrowings 10,872.1 7,797.3    
Other financing liabilities 846.9 900.0    
Secured Debt [Abstract]        
Other 1,535.3 717.6    
Long-term Line of Credit 947.6 900.3    
Mortgage Service Rights        
MSRs 2,466.3 2,272.2    
Level 3 | Fair Value | Interest Rate Contract        
Derivative financial instrument assets (liabilities), at fair value        
Derivative assets (liabilities) (0.5) 5.6    
Level 1 | Carrying Value | Others        
Derivative financial instrument assets (liabilities), at fair value        
Derivative assets (liabilities) (11.7) 8.9    
Level 1 | Fair Value | Others        
Derivative financial instrument assets (liabilities), at fair value        
Derivative assets (liabilities) $ (11.7) $ 8.9