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Commitments - Schedule of Activity Related to HMBS Repurchases (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Long-term Purchase Commitment [Line Items] |  |
Securitized Home Equity Conversion Mortgage-Backed Security | $ 7,772.9 |
Long-term Purchase Commitment [Roll Forward] |  |
Beginning balance, repurchase securities, amount | 186.0 |
Additions, repurchase securities, amount | 125.0 | $ 224.9
Recoveries, net, repurchase securities, amount | (122.4) |
Transfers, repurchase securities, amount | 0.0 |
Change in value, repurchase securities, amount | (3.2) |
Ending balance, repurchase securities, amount | 185.4 |
Maximum Claim Amount, Less Than 92% |  |
Long-term Purchase Commitment [Line Items] |  |
Securitized Home Equity Conversion Mortgage-Backed Security | 7,236.1 |
Maximum Claim Amount, Greater than 92% and Less Than 95% |  |
Long-term Purchase Commitment [Line Items] |  |
Securitized Home Equity Conversion Mortgage-Backed Security | 276.8 |
Maximum Claim Amount, Greater than 95% and less Than 98% |  |
Long-term Purchase Commitment [Line Items] |  |
Securitized Home Equity Conversion Mortgage-Backed Security | 260.1 |
Active |  |
Long-term Purchase Commitment [Roll Forward] |  |
Beginning balance, repurchase securities, amount | 55.4 |
Additions, repurchase securities, amount | 74.0 |
Recoveries, net, repurchase securities, amount | (81.1) |
Transfers, repurchase securities, amount | 2.4 |
Change in value, repurchase securities, amount | 0.2 |
Ending balance, repurchase securities, amount | 51.0 |
Inactive |  |
Long-term Purchase Commitment [Roll Forward] |  |
Beginning balance, repurchase securities, amount | 130.6 |
Additions, repurchase securities, amount | 51.0 |
Recoveries, net, repurchase securities, amount | (41.3) |
Transfers, repurchase securities, amount | (2.4) |
Change in value, repurchase securities, amount | (3.4) |
Ending balance, repurchase securities, amount | $ 134.4 |

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- Definition This represents the amount of additions to HMBS repurchase securities. + References No definition available. + Details
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Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This represents the amount of change in value of HMBS repurchase securities. + References No definition available. + Details
Name: | onit_ChangeInValueOfHomeEquityConversionMortgageBackedSecurityRepurchasesValue
Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This represents the amount of HMBS repurchase securities outstanding. + References No definition available. + Details
Name: | onit_HomeEquityConversionMortgageBackedSecurityRepurchasesOutstandingValue
Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Long-term Purchase Commitment + References No definition available. + Details
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- Definition This represents the amount of recoveries related to HMBS repurchase securities. + References No definition available. + Details
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- Definition Securitized Home Equity Conversion Mortgage-Backed Security + 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 This represents the amount of transfers related to HMBS repurchase securities. + References No definition available. + Details
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Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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 No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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