Debt Instrument, Option To Extend, Period

No definition available.

Name:	osnl_DebtInstrumentOptionToExtendPeriod
Namespace Prefix:	osnl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Accordion Feature, Increase Limit

+ References

No definition available.

+ Details

Name:	osnl_LineOfCreditFacilityAccordionFeatureIncreaseLimit
Namespace Prefix:	osnl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

+ Details

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

- Definition

Amount of assets pledged to secure a debt instrument.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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.

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+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Balance Type:	credit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Period Type:

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Period Type:

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Period Type:

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Period Type:

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Period Type:

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Debt - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
Debt - Narrative (Details) - USD ($) $ in Thousands	Aug. 28, 2024	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Jul. 23, 2025	Jun. 12, 2025	Jun. 11, 2025
Debt Instrument [Line Items]
Debt issued		$ 2,632,709
Secured Debt
Debt Instrument [Line Items]
Option to extend, period				1 year
Mortgage notes and credit facilities
Debt Instrument [Line Items]
Mortgage notes and credit facilities, net		1,643,928		$ 1,832,997
Unsecured term loan credit facility \| Mortgage notes and credit facilities
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,250,000
Basis spread on variable rate		1.35%
Debt issued		$ 1,250,000		1,250,000
Unsecured term loan credit facility \| Unsecured Debt \| Mortgage notes and credit facilities
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 1,250,000	$ 1,165,500
Unsecured term loan credit facility \| Unsecured Debt \| Mortgage notes and credit facilities \| Derivatives Not Designated as hedging instruments
Debt Instrument [Line Items]
Weighted average interest rate		5.00%
Unsecured term loan credit facility \| Unsecured Debt \| Mortgage notes and credit facilities \| Derivatives Designated as hedging instruments
Debt Instrument [Line Items]
Weighted average interest rate		5.00%
Unsecured term loan credit facility \| Unsecured Debt \| Mortgage notes and credit facilities \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Unsecured term loan credit facility \| Unsecured Debt \| Mortgage notes and credit facilities \| Fed Funds Effective Rate Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Unsecured term loan credit facility \| Unsecured Debt \| Mortgage notes and credit facilities \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Unsecured term loan credit facility \| Unsecured Debt \| Minimum \| Mortgage notes and credit facilities \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate		0.25%
Unsecured term loan credit facility \| Unsecured Debt \| Maximum \| Mortgage notes and credit facilities \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate		1.85%
Unsecured revolving credit facility \| Mortgage notes and credit facilities
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 2,610,000
Basis spread on variable rate		1.40%
Debt issued		$ 180,000		414,000
Unsecured revolving credit facility \| Revolving Credit Facility \| Mortgage notes and credit facilities
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 2,610,000	2,485,000	724,500
Line of credit facility, accordion feature, increase limit						$ 5,000	$ 3,200
Unsecured revolving credit facility \| Revolving Credit Facility \| Mortgage notes and credit facilities \| Interest rate swaps
Debt Instrument [Line Items]
Earned an additional income		$ 0	$ 208
Unsecured revolving credit facility \| Revolving Credit Facility \| Mortgage notes and credit facilities \| Derivatives Not Designated as hedging instruments
Debt Instrument [Line Items]
Weighted average interest rate		5.01%
Unsecured revolving credit facility \| Revolving Credit Facility \| Mortgage notes and credit facilities \| Derivatives Designated as hedging instruments
Debt Instrument [Line Items]
Weighted average interest rate		4.81%
Unsecured revolving credit facility \| Revolving Credit Facility \| Mortgage notes and credit facilities \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Unsecured revolving credit facility \| Revolving Credit Facility \| Mortgage notes and credit facilities \| Fed Funds Effective Rate Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Unsecured revolving credit facility \| Revolving Credit Facility \| Mortgage notes and credit facilities \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Unsecured revolving credit facility \| Revolving Credit Facility \| Minimum \| Mortgage notes and credit facilities \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate		0.30%
Unsecured revolving credit facility \| Revolving Credit Facility \| Minimum \| Mortgage notes and credit facilities \| CORRA
Debt Instrument [Line Items]
Basis spread on variable rate		0.30%
Unsecured revolving credit facility \| Revolving Credit Facility \| Maximum \| Mortgage notes and credit facilities \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate		1.90%
6.24% Senior Notes, Series A, due August 28, 2028
Debt Instrument [Line Items]
Basis spread on variable rate	6.24%
Debt issued	$ 29,000
6.32% Senior Notes, Series B, due August 28, 2029
Debt Instrument [Line Items]
Basis spread on variable rate	6.32%
Debt issued	$ 38,500
6.40% Senior Notes, Series C, due August 28, 2030
Debt Instrument [Line Items]
Basis spread on variable rate	6.40%
Debt issued	$ 39,500
6.43% Senior Notes, Series D, due August 28, 2031
Debt Instrument [Line Items]
Basis spread on variable rate	6.43%
Debt issued	$ 23,000
Master Repurchase Agreement \| Secured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,750,000
Basis spread on variable rate		1.68%
Secured financings of investments in real estate debt		$ 817,170		757,069
Debt instrument, collateral amount		556,370		497,710
Master Repurchase Agreement \| Secured Debt \| Commercial Real Estate Loans
Debt Instrument [Line Items]
Debt instrument, collateral amount		$ 669,465		$ 631,980
Master Repurchase Agreement \| Secured Overnight Financing Rate (SOFR) \| Secured Debt
Debt Instrument [Line Items]
Basis spread on variable rate		1.68%
Master Repurchase Agreement \| Minimum \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, term				1 month
Option to extend, period				1 month
Master Repurchase Agreement \| Maximum \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, term				3 months
Option to extend, period				3 months