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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($) $ in Millions	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Advances On Behalf of Borrowers [Line Items]
Advances, gross	$ 559.5		$ 686.1
Allowance for losses	(8.9)	$ (7.7)	(7.3)	$ (7.4)	$ (6.2)	$ (6.2)
Advances, net	550.6		678.8
Principal and interest
Advances On Behalf of Borrowers [Line Items]
Advances, gross	180.0		212.5
Taxes and insurance
Advances On Behalf of Borrowers [Line Items]
Advances, gross	253.6		343.3
Foreclosures, bankruptcy, REO and other (1)
Advances On Behalf of Borrowers [Line Items]
Advances, gross	125.9		$ 130.3
Foreclosures, bankruptcy, REO and other (1) | NEW YORK
Advances On Behalf of Borrowers [Line Items]
Advances, gross	34.8
Foreclosures, bankruptcy, REO and other (1) | FLORIDA
Advances On Behalf of Borrowers [Line Items]
Advances, gross	9.7
Foreclosures, bankruptcy, REO and other (1) | CALIFORNIA
Advances On Behalf of Borrowers [Line Items]
Advances, gross	8.8
Foreclosures, bankruptcy, REO and other (1) | PENNSYLVANIA
Advances On Behalf of Borrowers [Line Items]
Advances, gross	6.2
Foreclosures, bankruptcy, REO and other (1) | NEW JERSEY
Advances On Behalf of Borrowers [Line Items]
Advances, gross	$ 5.9

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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
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
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