Related Party Transactions (Star Holdings) (Details) - Star Holdings $ in Millions		3 Months Ended
Mar. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)
Safehold Inc.
Related Party Transaction [Line Items]
Ownership percentage	21.20%	21.20%
Spinco Manager \| Affiliated entity
Related Party Transaction [Line Items]
Annual management fee - Year 1	$ 25.0	$ 25.0
Annual management fee - Year 2	15.0	15.0
Annual management fee - Year 3	10.0	10.0
Annual management fee - Year 4	$ 5.0	$ 5.0
Annual management fee percent of gross book value, year five and thereafter	2.00%	2.00%
Management agreement initial term	1 year
Management agreement renewal term	1 year
Notice required to terminate management agreement without cause	180 days
Percentage approval of independent directors to terminate management agreement without cause	66.70%
Notice required to terminate management agreement with cause	30 days
Termination fee, termination without cause	$ 50.0	$ 50.0
Termination fee due to liquidation of consolidated assets after third anniversary of agreement	0.0	0.0
Termination fee due to reduction in consolidated assets - Year 1	30.0	30.0
Termination fee due to reduction in consolidated assets - Year 2	15.0	15.0
Termination fee due to reduction in consolidated assets - Year 3	$ 5.0	$ 5.0

Term of notice required to terminate management agreement with cause.

No definition available.

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- Definition

Term of notice required to terminate management agreement without cause.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage approval of independent directors to terminate management agreement without cause.

+ References

No definition available.

+ Details

Name:	safe_ManagementAgreementPercentageApprovalOfIndependentDirectorsRequiredToTerminateWithoutCauseTaxableIncomeIncludingCapitalGainsToBeDistributedToQualifyAsReit
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- Definition

Term of management agreement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Term of management agreement in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Fee due for the termination of the agreement in the event assets are liquidated after the third anniversary of the management agreement.

+ References

No definition available.

+ Details

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

- Definition

Fee due in the event the management agreement is terminated in year one based on a reduction in managed assets falling below designated thresholds.

+ References

No definition available.

+ Details

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Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fee due in the event the management agreement is terminated in year three based on a reduction in managed assets falling below designated thresholds.

+ References

No definition available.

+ Details

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

- Definition

Fee due in the event the management agreement is terminated in year two based on a reduction in managed assets falling below designated thresholds.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Fee due in the event the management agreement is terminated by the company without cause prior to the fourth anniversary of the agreement, net of the aggregate amount of management fees paid prior to termination.

+ References

No definition available.

+ Details

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

- Definition

The percentage of gross assets, net of common stock shares owned, used for determining annual fees for managing operations for year five and thereafter per a management agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	safe_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of fees to be paid for management of operations in year four per a management agreement.

+ References

No definition available.

+ Details

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

- Definition

The amount of fees to be paid for management of operations in year one per a management agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of fees to be paid for management of operations in year three per a management agreement.

+ References

No definition available.

+ Details

Name:	safe_OperationManagementFeeExpenseYearThree
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of fees to be paid for management of operations in year two per a management agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
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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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