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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Advances On Behalf of Borrowers [Line Items]
Advances, gross	$ 531.1		$ 686.1
Allowance for losses	(8.4)	$ (8.9)	(7.3)	$ (7.2)	$ (7.4)	$ (6.2)
Advances, net	522.7		678.8
GSE
Advances On Behalf of Borrowers [Line Items]
Advances, net	49.8		100.8
GinnieMae
Advances On Behalf of Borrowers [Line Items]
Advances, net	54.3		60.2
Non-Agency
Advances On Behalf of Borrowers [Line Items]
Advances, net	418.6		517.7
Principal and interest
Advances On Behalf of Borrowers [Line Items]
Advances, gross	166.1		212.5
Taxes and insurance
Advances On Behalf of Borrowers [Line Items]
Advances, gross	240.3		343.3
Foreclosures, bankruptcy, REO and other (1)
Advances On Behalf of Borrowers [Line Items]
Advances, gross	124.7		$ 130.3
Foreclosures, bankruptcy, REO and other (1) | NEW YORK
Advances On Behalf of Borrowers [Line Items]
Advances, gross	33.5
Foreclosures, bankruptcy, REO and other (1) | FLORIDA
Advances On Behalf of Borrowers [Line Items]
Advances, gross	9.1
Foreclosures, bankruptcy, REO and other (1) | CALIFORNIA
Advances On Behalf of Borrowers [Line Items]
Advances, gross	8.9
Foreclosures, bankruptcy, REO and other (1) | PENNSYLVANIA
Advances On Behalf of Borrowers [Line Items]
Advances, gross	5.7
Foreclosures, bankruptcy, REO and other (1) | NEW JERSEY
Advances On Behalf of Borrowers [Line Items]
Advances, gross	$ 5.3

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Advances On Behalf of Borrowers [Line Items]

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Total advance payments made by financial institutions on behalf of borrowers in a servicing relationship.

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Total advance payments net of valuation allowance made by financial institutions on behalf of borrowers in a servicing relationship.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
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-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Topic 942
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