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Subsequent Events - Narrative (Details) $ / shares in Units, $ in Millions		1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 30, 2020 USD ($)	Aug. 05, 2020 USD ($) numberOfLoanPools	Aug. 04, 2020	Jun. 30, 2020 USD ($) loan $ / shares	Jun. 30, 2019 USD ($) loan $ / shares	Jun. 30, 2020 USD ($) loan $ / shares	Jun. 30, 2019 USD ($) loan $ / shares	May 06, 2020 USD ($)	May 03, 2020 $ / shares	Mar. 31, 2020 $ / shares	Mar. 24, 2020 $ / shares	Mar. 31, 2019 $ / shares
Subsequent Event [Line Items]
Aggregate unpaid principal balance of mortgage loans on real estate					$ 200.1	$ 26.2	$ 200.1
Estimated market value of the underlying collateral				$ 44.2	$ 320.1	$ 44.2	$ 320.1
Dividends payable, amount per share (in dollars per share) | $ / shares				$ 0.17	$ 0.32	$ 0.17	$ 0.32		$ 0.17	$ 0.32	$ 0.32	$ 0.32
Residential RPLs loans
Subsequent Event [Line Items]
Number of mortgage loans on real estate | loan				0	496	26	534
Aggregate unpaid principal balance of mortgage loans on real estate					$ 106.6	$ 2.0	$ 115.1
Residential RPLs loans | One Seller
Subsequent Event [Line Items]
Percentage of estimated market value of the underlying collateral								66.20%
Estimated market value of the underlying collateral								$ 60.9
Residential NPL loans
Subsequent Event [Line Items]
Number of mortgage loans on real estate | loan				0	0	1	0
Aggregate unpaid principal balance of mortgage loans on real estate						$ 0.2
Subsequent Event | Ajax Mortgage Loan Trust 2020-B [Member]
Subsequent Event [Line Items]
Securities Percentage of Total UPB	73.20%
Subsequent Event | Ajax Mortgage Loan Trust 2020-B [Member] | Mortgage loans | Class A Notes
Subsequent Event [Line Items]
Original Principal	$ 97.2
Subsequent Event | Ajax Mortgage Loan Trust 2020-B [Member] | Mortgage loans | Senior Notes
Subsequent Event [Line Items]
Original Principal	17.3
Subsequent Event | Four Sellers [Member]
Subsequent Event [Line Items]
Number of transaction | numberOfLoanPools		4
Subsequent Event | Residential RPLs loans | Ajax Mortgage Loan Trust 2020-B [Member]
Subsequent Event [Line Items]
Aggregate unpaid principal balance of mortgage loans on real estate	$ 156.5
Percentage of unpaid principal balance of loan acquired	1.874%
Subsequent Event | Residential RPLs loans | One Seller
Subsequent Event [Line Items]
Number of mortgage loans on real estate | numberOfLoanPools		239
Aggregate unpaid principal balance of mortgage loans on real estate		$ 45.4
Percentage of unpaid principal balance of loan acquired			88.90%
Subsequent Event | Residential RPLs loans | Eight Sellers [Member]
Subsequent Event [Line Items]
Number of mortgage loans on real estate | numberOfLoanPools		29
Aggregate unpaid principal balance of mortgage loans on real estate		$ 8.1
Number of transaction | numberOfLoanPools		8
Percentage of unpaid principal balance of loan acquired		87.10%
Percentage of estimated market value of the underlying collateral		61.30%
Estimated market value of the underlying collateral		$ 11.4
Subsequent Event | Residential RPLs loans | Nine Sellers [Member]
Subsequent Event [Line Items]
Number of transaction | numberOfLoanPools		9
Subsequent Event | Residential NPL loans | One Seller
Subsequent Event [Line Items]
Number of mortgage loans on real estate | numberOfLoanPools		3,000
Aggregate unpaid principal balance of mortgage loans on real estate		$ 0.9
Number of transaction | numberOfLoanPools		1
Percentage of unpaid principal balance of loan acquired		77.20%
Percentage of estimated market value of the underlying collateral		58.00%
Estimated market value of the underlying collateral		$ 1.2
Subsequent Event | small balance commercial loans [Member] | One Seller
Subsequent Event [Line Items]
Number of mortgage loans on real estate | numberOfLoanPools		2,000
Aggregate unpaid principal balance of mortgage loans on real estate		$ 2.1
Percentage of unpaid principal balance of loan acquired		100.00%
Board of Directors
Subsequent Event [Line Items]
Dividends payable, amount per share (in dollars per share) | $ / shares									$ 0.17

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