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Debt - Schedule of Securitization Notes Outstanding (Details) - Mortgage loans $ in Millions	Sep. 30, 2024 USD ($)
Class A-1 Notes | Ajax Mortgage Loan Trust 2019-D/ July 2019
Debt Instrument [Line Items]
Original Principal	$ 140.4
Interest Rate	2.96%
Class A-1 Notes | Ajax Mortgage Loan Trust 2019-F/ November 2019
Debt Instrument [Line Items]
Original Principal	$ 110.1
Interest Rate	2.86%
Class A-1 Notes | Ajax Mortgage Loan Trust 2020-B/ August 2020
Debt Instrument [Line Items]
Original Principal	$ 97.2
Interest Rate	1.70%
Class A-1 Notes | Ajax Mortgage Loan Trust 2021-A/ January 2021
Debt Instrument [Line Items]
Original Principal	$ 146.2
Interest Rate	1.07%
Class A-2 Notes | Ajax Mortgage Loan Trust 2019-D/ July 2019
Debt Instrument [Line Items]
Original Principal	$ 6.1
Interest Rate	3.50%
Class A-2 Notes | Ajax Mortgage Loan Trust 2019-F/ November 2019
Debt Instrument [Line Items]
Original Principal	$ 12.5
Interest Rate	3.50%
Class A-2 Notes | Ajax Mortgage Loan Trust 2020-B/ August 2020
Debt Instrument [Line Items]
Original Principal	$ 17.3
Interest Rate	2.86%
Class A-2 Notes | Ajax Mortgage Loan Trust 2021-A/ January 2021
Debt Instrument [Line Items]
Original Principal	$ 21.1
Interest Rate	2.35%
Class A-3 Notes | Ajax Mortgage Loan Trust 2019-D/ July 2019
Debt Instrument [Line Items]
Original Principal	$ 10.1
Interest Rate	3.50%
Class A-3 Notes | Ajax Mortgage Loan Trust 2019-F/ November 2019
Debt Instrument [Line Items]
Original Principal	$ 5.1
Interest Rate	3.50%
Class M-1 Notes | Ajax Mortgage Loan Trust 2019-D/ July 2019
Debt Instrument [Line Items]
Original Principal	$ 9.3
Interest Rate	3.50%
Class M-1 Notes | Ajax Mortgage Loan Trust 2019-F/ November 2019
Debt Instrument [Line Items]
Original Principal	$ 6.1
Interest Rate	3.50%
Class M-1 Notes | Ajax Mortgage Loan Trust 2020-B/ August 2020
Debt Instrument [Line Items]
Original Principal	$ 7.3
Interest Rate	3.70%
Class M-1 Notes | Ajax Mortgage Loan Trust 2021-A/ January 2021
Debt Instrument [Line Items]
Original Principal	$ 7.8
Interest Rate	3.15%
Class B-1 Notes | Ajax Mortgage Loan Trust 2019-D/ July 2019
Debt Instrument [Line Items]
Original Principal	$ 7.5
Interest Rate	3.50%
Class B-1 Notes | Ajax Mortgage Loan Trust 2019-F/ November 2019
Debt Instrument [Line Items]
Original Principal	$ 11.5
Interest Rate	3.50%
Class B-1 Notes | Ajax Mortgage Loan Trust 2020-B/ August 2020
Debt Instrument [Line Items]
Original Principal	$ 5.9
Interest Rate	3.70%
Class B-1 Notes | Ajax Mortgage Loan Trust 2021-A/ January 2021
Debt Instrument [Line Items]
Original Principal	$ 5.0
Interest Rate	3.80%
Class B-2 Notes | Ajax Mortgage Loan Trust 2019-D/ July 2019
Debt Instrument [Line Items]
Original Principal	$ 7.1
Class B-2 Notes | Ajax Mortgage Loan Trust 2019-F/ November 2019
Debt Instrument [Line Items]
Original Principal	10.4
Class B-2 Notes | Ajax Mortgage Loan Trust 2020-B/ August 2020
Debt Instrument [Line Items]
Original Principal	5.1
Class B-2 Notes | Ajax Mortgage Loan Trust 2021-A/ January 2021
Debt Instrument [Line Items]
Original Principal	5.0
Class B-3 Notes | Ajax Mortgage Loan Trust 2019-D/ July 2019
Debt Instrument [Line Items]
Original Principal	12.8
Class B-3 Notes | Ajax Mortgage Loan Trust 2019-F/ November 2019
Debt Instrument [Line Items]
Original Principal	15.1
Class B-3 Notes | Ajax Mortgage Loan Trust 2020-B/ August 2020
Debt Instrument [Line Items]
Original Principal	23.6
Class B-3 Notes | Ajax Mortgage Loan Trust 2021-A/ January 2021
Debt Instrument [Line Items]
Original Principal	$ 21.5
Deferred issuance costs | Ajax Mortgage Loan Trust 2019-D/ July 2019
Debt Instrument [Line Items]
Interest Rate	0.00%
Debt issuance costs, net	$ 2.7
Deferred issuance costs | Ajax Mortgage Loan Trust 2019-F/ November 2019
Debt Instrument [Line Items]
Interest Rate	0.00%
Debt issuance costs, net	$ 1.8
Deferred issuance costs | Ajax Mortgage Loan Trust 2020-B/ August 2020
Debt Instrument [Line Items]
Interest Rate	0.00%
Debt issuance costs, net	$ 1.8
Deferred issuance costs | Ajax Mortgage Loan Trust 2021-A/ January 2021
Debt Instrument [Line Items]
Interest Rate	0.00%
Debt issuance costs, net	$ 2.5

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