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Contingencies - Schedule of Indemnification Obligations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Indemnification Obligations Liability [Roll Forward]
Beginning balance			$ 27.4	$ 32.9
Provision for (reversal of) representation and warranty obligations			(1.5)	(3.2)
Provision for representation and warranty obligations - New production liability			2.6	1.7
Charge-offs and other			(5.2)	(1.2)
Ending balance	$ 23.3	$ 30.2	23.3	30.2
Servicing and subservicing fees	$ 217.5	$ 211.1	$ 632.1	$ 626.5

X

- Definition

Represents amount of charge-offs against indemnification obligations liability.

+ References

No definition available.

+ Details

Name:	onit_IndemnificationObligationsLiabilityChargeOffs
Namespace Prefix:	onit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents addition of indemnification obligations reserves for new loan production during the period.

+ References

No definition available.

+ Details

Name:	onit_IndemnificationObligationsLiabilityReserves
Namespace Prefix:	onit_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

X

- Definition

Represents provision for representation and warranty obligations.

+ References

No definition available.

+ Details

Name:	onit_ProvisionForRepresentationAndWarrantyObligations
Namespace Prefix:	onit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This represents the outstanding obligation of repurchase the loans, or otherwise indemnify or reimburse the investor or insurer for losses incurred due to material breach of contractual representation and warranties.

+ References

No definition available.

+ Details

Name:	onit_RepresentationWarrantyAndCompensatoryFeesObligations
Namespace Prefix:	onit_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This represents the amount of the fee earned, generally expressed as a percent of UPB, from the borrowers’ payments. Also includes late fees, prepayment penalties, float earnings and other ancillary fees.

+ References

No definition available.

+ Details

Name:	onit_ServicingAndSubservicingFees
Namespace Prefix:	onit_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration