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Cover
Nov. 29, 2022
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Nov. 29, 2022
Entity File Number 1-15371
Entity Registrant Name iStar Inc.
Entity Central Index Key 0001095651
Entity Tax Identification Number 95-6881527
Entity Incorporation, State or Country Code MD
Entity Address, Address Line One 1114 Avenue of the Americas
Entity Address, Address Line Two 39th Floor
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10036
City Area Code 212
Local Phone Number 930-9400
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock  
Document Information [Line Items]  
Title of 12(b) Security Common Stock
Trading Symbol STAR
Security Exchange Name NYSE
8.00% Series D Cumulative Redeemable Preferred Stock, $0.001 par value  
Document Information [Line Items]  
Title of 12(b) Security 8.00% Series D Cumulative Redeemable Preferred Stock, $0.001 par value
Trading Symbol STAR-PD
Security Exchange Name NYSE
7.65% Series G Cumulative Redeemable Preferred Stock, $0.001 par value  
Document Information [Line Items]  
Title of 12(b) Security 7.65% Series G Cumulative Redeemable Preferred Stock, $0.001 par value
Trading Symbol STAR-PG
Security Exchange Name NYSE
7.50% Series I Cumulative Redeemable Preferred Stock, $0.001 par value  
Document Information [Line Items]  
Title of 12(b) Security 7.50% Series I Cumulative Redeemable Preferred Stock, $0.001 par value
Trading Symbol STAR-PI
Security Exchange Name NYSE