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Securitizations and Variable Interest Entities - Schedule of Assets That Relate to Continuing Involvement with Transferred Financial Assets with Servicing Rights and Maximum Exposure to Loss Including the Unpaid Principal Balance (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
UPB of loans transferred	$ 60,816.8	$ 49,641.2
Maximum exposure to loss	61,814.0	50,505.0
Ginnie Mae
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
UPB of loans transferred	15,500.0	11,700.0
Mortgage Servicing Rights - Fair Value
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Carrying value of assets	903.8	734.2
Advances
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Carrying value of assets	$ 93.4	$ 129.6

X

- Definition

Maximum exposure to loss related to continuing involvement with forward loans that have been transferred with servicing rights retained as well as standard representations and warranties obligations.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Unpaid principal balance of forward loans transferred with servicing rights retained.

+ References

No definition available.

+ Details

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Namespace Prefix:	onit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The carrying amount (fair value) as of the balance sheet date of the transferor's interests in transferred financial assets (typically securitized receivables, generally not involved in the collection of principal) following transfer of significant portions of such financial instruments to other parties. Such interests could be ancillary cash flows and interest-only strips.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4

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- Details

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