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Contingencies - Schedule of Indemnification Obligations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Indemnification Obligations Liability [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 32.9 | $ 41.6
Provision for (reversal of) representation and warranty obligations |  |  | (3.2) | 2.9
Provision for representation and warranty obligations - New production liability |  |  | 1.7 | 1.3
Charge-offs and other |  |  | (1.2) | (8.3)
Ending balance | $ 30.2 | $ 37.5 | 30.2 | 37.5
Servicing and subservicing fees | $ 211.1 | $ 237.8 | $ 626.5 | $ 707.5

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