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Commitments and Contingencies - Unfunded and Other Commitments (Details) $ in Millions | Dec. 31, 2023 USD ($)
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Unfunded commitments |
Leasehold improvement allowance, unfunded, pending milestone achievement | $ 115.0
Future funding obligation, amount | 283.1
Performance-based commitments | $ 111.1

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 + References No definition available. + Details
Name: | safe_RealEstateLeaseholdImprovementAllowanceUnfundedPendingMilestoneAchievement
Namespace Prefix: | safe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition N/A + References No definition available. + Details
Name: | safe_UnfundedCommitmentsAbstract
Namespace Prefix: | safe_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration