Subsequent Events (Details) $ / shares in Units, $ in Millions			1 Months Ended			3 Months Ended		6 Months Ended
	Jul. 24, 2023 USD ($) loan	Jul. 11, 2023 USD ($)	Aug. 04, 2023 USD ($) transaction residential_rpl	Apr. 30, 2023 USD ($) residential_rpl	Feb. 28, 2023 USD ($) residential_rpl	Jun. 30, 2023 USD ($) loan	Jun. 30, 2022 USD ($) loan	Jun. 30, 2023 USD ($) loan	Jun. 30, 2022 USD ($) loan	Aug. 03, 2023 $ / shares
Subsequent event
Subsequent Event [Line Items]
Dividends payable, amount per share (in dollars per share) | $ / shares										$ 0.20
Subsequent event | Class A Senior Bond
Subsequent Event [Line Items]
Debt securities, realized loss		$ 0.4
Subsequent event | Class A Senior Bond | Accumulated net investment gain (loss) attributable to parent
Subsequent Event [Line Items]
Debt securities, realized loss		$ 0.4
Ajax Mortgage Loan Trust 2023-B | Subsequent event
Subsequent Event [Line Items]
Number of mortgage loans on real estate | loan	571
Aggregate unpaid principal balance of mortgage loans on real estate	$ 121.7
Securities retained, value	20.7
Securities retained, re-performing loans and non-performing loans acquired, amount	$ 252.2
Securities retained with unpaid principal balance percentage (in percent)	0.750
Securities retained, weighted average coupon (in percent)	4.25%
Ajax Mortgage Loan Trust 2023-B | Subsequent event | Third Party Institutional Investor
Subsequent Event [Line Items]
Ownership percentage by third parties (in percent)	20.00%
Ajax Mortgage Loan Trust 2023-C | Subsequent event
Subsequent Event [Line Items]
Number of mortgage loans on real estate | loan	1,171
Aggregate unpaid principal balance of mortgage loans on real estate	$ 203.6
Securities retained, value	36.1
Securities retained, re-performing loans and non-performing loans acquired, amount	$ 459.1
Securities retained, rated securities with unpaid principal balance percentage (in percent)	72.40%
Securities retained, weighted average coupon (in percent)	3.45%
Ajax Mortgage Loan Trust 2023-C | Subsequent event | Third Party Institutional Investor | Class AAA Notes
Subsequent Event [Line Items]
Ownership percentage by third parties (in percent)	20.00%
Residential NPLs
Subsequent Event [Line Items]
Number of mortgage loans on real estate | loan						0	1	0	5
Aggregate unpaid principal balance of mortgage loans on real estate							$ 0.2		$ 1.1
Residential NPLs | One seller | Subsequent event
Subsequent Event [Line Items]
Number of mortgage loans on real estate | residential_rpl			1
Number of transactions | transaction			1
Aggregate unpaid principal balance of mortgage loans on real estate			$ 0.2
Percentage of unpaid principal balance of loan acquired (in percent)			94.00%
Percentage of estimated market value of the underlying collateral (in percent)			63.80%
Estimated market value of the underlying collateral			$ 0.3
Securities retained, weighted average coupon (in percent)			8.38%
Residential RPLs
Subsequent Event [Line Items]
Number of mortgage loans on real estate				2	1	68	6	71	6
Aggregate unpaid principal balance of mortgage loans on real estate				$ 0.3	$ 0.2	$ 16.3	$ 1.2	$ 17.1	$ 1.2
Estimated market value of the underlying collateral				$ 0.5	$ 0.4
Residential RPLs | Subsequent event
Subsequent Event [Line Items]
Number of mortgage loans on real estate | residential_rpl			1
Number of transactions | transaction			1
Aggregate unpaid principal balance of mortgage loans on real estate			$ 0.2
Percentage of unpaid principal balance of loan acquired (in percent)			80.00%
Percentage of estimated market value of the underlying collateral (in percent)			55.00%
Estimated market value of the underlying collateral			$ 0.3
Securities retained, weighted average coupon (in percent)			5.75%