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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Advances On Behalf of Borrowers [Line Items]
Advances, gross	$ 521.5	$ 584.6
Allowance for losses	(7.5)	(7.4)	$ (7.7)	$ (7.3)
Advances, net	514.0	577.2
GSE
Advances On Behalf of Borrowers [Line Items]
Advances, net	64.6	94.0
GinnieMae
Advances On Behalf of Borrowers [Line Items]
Advances, net	63.1	70.6
Non-Agency
Advances On Behalf of Borrowers [Line Items]
Advances, net	386.3	412.6
Principal and interest
Advances On Behalf of Borrowers [Line Items]
Advances, gross	145.2	150.1
Taxes and insurance
Advances On Behalf of Borrowers [Line Items]
Advances, gross	253.6	314.2
Foreclosures, bankruptcy, REO and other (1)
Advances On Behalf of Borrowers [Line Items]
Advances, gross	122.7	$ 120.3
Foreclosures, bankruptcy, REO and other (1) | NEW YORK
Advances On Behalf of Borrowers [Line Items]
Advances, gross	$ 31.2
Minimum Balance Of Total Advances, Percent	5.00%

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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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Minimum Balance Of Total Advances, Percent

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

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