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MSR Valuation Allowance, Net (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
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 $ 2,762.9   $ 2,762.9   $ 2,632.6 $ 2,466.3 $ 2,327.7 $ 2,272.2
Other financing liabilities, at fair value 822.0   822.0     846.9    
Servicing Asset at Fair Value, Period Increase (Decrease) (72.4)   (184.6)          
Derivative, Gain (Loss) on Derivative, Net 21.5 $ (19.4) 16.3 $ 76.7        
MSR valuation adjustments, net (45.0) (31.5) (111.1) (75.8)        
Total MSR Reserve Fair Value Gains (Losses) (72.4) (110.3) (184.6) (31.1)        
Financing Liability Mortgage Servicing Rights Pledged [Member]                
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 566.7   566.7     583.5    
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 2,800.0   2,800.0          
Servicing Asset at Fair Value, Change In Fair Value Due To Realization Of Expected Cash Flows (48.8) (40.2) (133.3) (118.2)        
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions 3.8 8.7 22.2 42.4        
Financing Liability Excess Servicing Spread [Member]                
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 255.3   255.3     $ 263.3    
Financing Liability Mortgage Servicing Rights Pledged [Member]                
Assets that Continue to be Recognized, Securitized or Asset-Backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]                
Derivative, Gain (Loss) on Derivative, Net 10.6 54.3 25.9 (50.0)        
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) (10.8) (17.2) (26.7) 0.2        
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 $ 6.0 $ 7.2 $ 20.8 $ 5.5