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Other Financing Liabilities - Schedule of Financing Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Debt Instrument [Line Items]          
Other financing liabilities, at fair value $ 1,380.3   $ 1,380.3   $ 1,137.4
Servicing and subservicing fees 237.8 $ 215.6 707.5 $ 643.3  
Proceeds from other financing liabilities - Excess Servicing Spread (ESS) liability     68.7 $ 36.2  
Other counterparties for Pledged MSR liab. | Financing Liabilities          
Debt Instrument [Line Items]          
Other financing liabilities, at fair value 120.8   120.8   0.7
ESS Financing Liability          
Debt Instrument [Line Items]          
Other financing liabilities, at fair value 255.4   255.4   199.0
ESS Financing Liability          
Debt Instrument [Line Items]          
Other financing liabilities, at fair value 1,119.1   1,119.1   931.7
Residential Asset Securitization Trust          
Debt Instrument [Line Items]          
Other financing liabilities, at fair value 5.9   5.9   6.7
Original Rights to Mortgage Servicing Rights Agreements | ESS Financing Liability          
Debt Instrument [Line Items]          
Other financing liabilities, at fair value 577.8   577.8   601.2
MAV MSR Sale Agreements | ESS Financing Liability          
Debt Instrument [Line Items]          
Other financing liabilities, at fair value $ 420.4   $ 420.4   $ 329.8