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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($) $ in Millions	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Advances On Behalf of Borrowers [Line Items]
Advances, gross	$ 467.8		$ 584.6
Allowance for losses	(6.4)	$ (7.5)	(7.4)	$ (8.9)	$ (7.7)	$ (7.3)
Advances, net	461.4		577.2
GSE
Advances On Behalf of Borrowers [Line Items]
Advances, net	43.9		94.0
Ginnie Mae
Advances On Behalf of Borrowers [Line Items]
Advances, net	51.6		70.6
Non-Agency
Advances On Behalf of Borrowers [Line Items]
Advances, net	365.9		412.6
Principal and interest
Advances On Behalf of Borrowers [Line Items]
Advances, gross	131.2		150.1
Taxes and insurance
Advances On Behalf of Borrowers [Line Items]
Advances, gross	211.9		314.2
Foreclosures, bankruptcy, REO and other (1)
Advances On Behalf of Borrowers [Line Items]
Advances, gross	124.6		$ 120.3
Foreclosures, bankruptcy, REO and other (1) | NEW YORK
Advances On Behalf of Borrowers [Line Items]
Advances, gross	$ 29.4
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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