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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 210
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-Topic 326
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Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
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-Section S99
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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Advances On Behalf of Borrowers [Line Items]
Advances, gross	$ 434.3	$ 487.9
Allowance for losses	(3.2)	(4.5)	$ (7.5)	$ (7.4)
Advances, net (2)	431.1	483.4
Subservicing Client One \| Advanaces \| Counterparty Risk
Advances On Behalf of Borrowers [Line Items]
Advances, net (2)	30.6
GSE
Advances On Behalf of Borrowers [Line Items]
Advances, net (2)	61.2	82.2
Ginnie Mae
Advances On Behalf of Borrowers [Line Items]
Advances, net (2)	58.8	63.3
Non-Agency
Advances On Behalf of Borrowers [Line Items]
Advances, net (2)	311.0	337.9
Principal and interest
Advances On Behalf of Borrowers [Line Items]
Advances, gross	90.9	98.9
Taxes and insurance
Advances On Behalf of Borrowers [Line Items]
Advances, gross	208.9	278.8
Foreclosures, bankruptcy, REO and other (1)
Advances On Behalf of Borrowers [Line Items]
Advances, gross	134.4	$ 110.2
Foreclosures, bankruptcy, REO and other (1) \| NEW YORK
Advances On Behalf of Borrowers [Line Items]
Advances, gross	$ 24.6
Minimum Balance Of Total Advances, Percent	5.00%