XML 100 R72.htm IDEA: XBRL DOCUMENT v3.25.3

Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Advances On Behalf of Borrowers [Line Items]
Advances, gross	$ 440.7		$ 584.6
Allowance for losses	(5.6)	$ (6.4)	(7.4)	$ (8.4)	$ (8.9)	$ (7.3)
Advances, net	435.1		577.2
GSE
Advances On Behalf of Borrowers [Line Items]
Advances, net	41.5		94.0
Ginnie Mae
Advances On Behalf of Borrowers [Line Items]
Advances, net	52.5		70.6
Non-Agency
Advances On Behalf of Borrowers [Line Items]
Advances, net	341.2		412.6
Principal and interest
Advances On Behalf of Borrowers [Line Items]
Advances, gross	117.7		150.1
Taxes and insurance
Advances On Behalf of Borrowers [Line Items]
Advances, gross	205.3		314.2
Foreclosures, bankruptcy, REO and other (1)
Advances On Behalf of Borrowers [Line Items]
Advances, gross	117.7		$ 120.3
Foreclosures, bankruptcy, REO and other (1) | NEW YORK
Advances On Behalf of Borrowers [Line Items]
Advances, gross	$ 26.8
Minimum Balance Of Total Advances, Percent	5.00%

X

- Definition

Advances On Behalf of Borrowers [Line Items]

+ References

No definition available.

+ Details

Name:	onit_AdvancesOnBehalfOfBorrowersLineItems
Namespace Prefix:	onit_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

Name:	onit_AdvancesPaymentsOnBehalfOfBorrowerGross
Namespace Prefix:	onit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

Name:	onit_AdvancesPaymentsOnBehalfOfBorrowerNetOfValuationAllowance
Namespace Prefix:	onit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Minimum Balance Of Total Advances, Percent

+ References

No definition available.

+ Details

Name:	onit_MinimumBalanceOfTotalAdvancesPercent
Namespace Prefix:	onit_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

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 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (1)
-Publisher SEC

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (3)
-Publisher SEC

Reference 7: 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
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	onit_InvestorAxis=onit_GSEMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	onit_InvestorAxis=onit_GinnieMaeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	onit_InvestorAxis=onit_NonAgencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=onit_PrincipalAndInterestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=onit_TaxesAndInsuranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=onit_ForeclosuresAndBankruptcyCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_NY
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: