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Other Financing Liabilities - Schedule of Financing Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Debt Instrument [Line Items]          
Other financing liabilities, at fair value $ 1,274.0   $ 1,274.0   $ 1,137.4
Servicing and subservicing fees 237.6 $ 215.1 469.7 $ 427.8  
Proceeds from other financing liabilities - Excess Servicing Spread (ESS) liability     68.7 $ 0.0  
Other counterparties for Pledged MSR liab. | Financing Liabilities          
Debt Instrument [Line Items]          
Other financing liabilities, at fair value 112.7   112.7   0.7
ESS Financing Liability          
Debt Instrument [Line Items]          
Other financing liabilities, at fair value 258.5   258.5   199.0
ESS Financing Liability          
Debt Instrument [Line Items]          
Other financing liabilities, at fair value 1,009.5   1,009.5   931.7
Residential Asset Securitization Trust          
Debt Instrument [Line Items]          
Other financing liabilities, at fair value 6.0   6.0   6.7
Original Rights to Mortgage Servicing Rights Agreements | ESS Financing Liability          
Debt Instrument [Line Items]          
Other financing liabilities, at fair value 577.1   577.1   601.2
MAV MSR Sale Agreements | ESS Financing Liability          
Debt Instrument [Line Items]          
Other financing liabilities, at fair value $ 319.7   $ 319.7   $ 329.8