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Commitments and Contingencies - Unfunded and Other Commitments (Details) $ in Millions	Sep. 30, 2025 USD ($)
Unfunded commitments
Leasehold improvement allowance, unfunded, pending milestone achievement	$ 84.5
Unfunded forward commitment, amount	35.0
Performance-based commitments	$ 106.3

X

- Definition

Long-term Purchase Commitment, Future Funding Obligation, Amount

+ References

No definition available.

+ Details

Name:	safe_LongTermPurchaseCommitmentFutureFundingObligationAmount
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the off-balance sheet unfunded maximum amount of funds for construction and development loans and build-outs of space in net lease assets over a period of time if and when the borrowers and tenants meet established milestones and other performance criteria.

+ References

No definition available.

+ Details

Name:	safe_PerformanceBasedCommitments
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Real Estate, Leasehold Improvement Allowance, Unfunded, Pending Milestone Achievement

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No definition available.

+ Details

Name:	safe_RealEstateLeaseholdImprovementAllowanceUnfundedPendingMilestoneAchievement
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

N/A

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No definition available.

+ Details

Name:	safe_UnfundedCommitmentsAbstract
Namespace Prefix:	safe_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration