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Other Financing Liabilities - Schedule of Financing Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Debt Instrument [Line Items]      
Other financing liabilities, at fair value $ 906.8   $ 900.0
Servicing and subservicing fees 204.5 $ 232.2  
Proceeds from other financing liabilities - Excess Servicing Spread (ESS) liability 0.0 $ 68.7  
Other counterparties for Pledged MSR liab. | Financing Liabilities      
Debt Instrument [Line Items]      
Other financing liabilities, at fair value 125.3   115.3
ESS Financing Liability      
Debt Instrument [Line Items]      
Other financing liabilities, at fair value 253.4   248.9
ESS Financing Liability      
Debt Instrument [Line Items]      
Other financing liabilities, at fair value 647.9   645.5
Residential Asset Securitization Trust      
Debt Instrument [Line Items]      
Other financing liabilities, at fair value 5.5   5.6
Original Rights to Mortgage Servicing Rights Agreements | ESS Financing Liability      
Debt Instrument [Line Items]      
Other financing liabilities, at fair value 119.8   121.0
MAV MSR Sale Agreements | ESS Financing Liability      
Debt Instrument [Line Items]      
Other financing liabilities, at fair value $ 402.7   $ 409.2