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Other Investments (Safehold Inc). (Details)
$ / shares in Units, ft² in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Apr. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
shares
Feb. 28, 2022
USD ($)
Nov. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jul. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
agreement
ft²
Feb. 28, 2021
USD ($)
Jan. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
May 31, 2019
Jan. 31, 2019
USD ($)
$ / shares
shares
Oct. 31, 2017
USD ($)
Sep. 30, 2022
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Jan. 02, 2019
Schedule of Equity Method Investments [Line Items]                                                
Number of limited partnership units purchased (in shares) | shares                             12,500,000                  
Investor units, purchase price per unit (in dollars per share) | $ / shares                             $ 20.00                  
Cash investment in equity method investments                             $ 250,000,000.0         $ 273,206,000 $ 171,005,000      
Conversion of stock                           1                    
Restriction period on common stock received as payment                                       2 years        
Management agreement, termination fee as multiple of prior year management fee                                 3     3        
Income from sales of real estate                                 $ 951,000 $ 25,611,000   $ 1,443,000 26,319,000      
Equity method investments                                 1,605,268,000     1,605,268,000   $ 1,297,281,000    
Payment to acquire purchase option agreement                                     $ 1,000,000.0          
Expenses incurred in acquisition of purchase option agreement                                     200,000          
SAFE                                                
Schedule of Equity Method Investments [Line Items]                                                
Expense reimbursements from related party                                 3,100,000 1,900,000   9,400,000 5,600,000      
Proceeds from sale of ground lease $ 36,000,000.0                                              
Gain (loss) from sale of ground lease $ 1,000,000.0                                              
Proceeds from sale of purchase option agreement                 $ 1,200,000                   1,200,000          
Gain recognized on sale of purchase option agreement                 $ 0                              
Number of agreements | agreement                 2                              
Sale price per agreement for sale of land and related Ground Lease, subject to certain conditions being met           $ 33,300,000     $ 42,000,000.0                   $ 42,000,000.0          
Multiple required that may trigger receipt of additional consideration           1.25     1.25                   1.25          
Percentage of required return on investment that may trigger receipt of additional consideration           12.00%     9.00%                              
Management Fees | SAFE                                                
Schedule of Equity Method Investments [Line Items]                                                
Management fee revenue from related party                                 5,300,000 3,600,000   $ 15,000,000.0 10,600,000      
Maximum | SAFE                                                
Schedule of Equity Method Investments [Line Items]                                                
Leasehold improvement allowance, Ground Leases           $ 51,800,000     $ 83,000,000.0                   $ 83,000,000.0          
Fee percent of SAFE Equity up to $1.5 billion                                                
Schedule of Equity Method Investments [Line Items]                                                
Management fee as percent of equity                                       1.00%        
Fee percent of SAFE Equity up to $1.5 billion | Maximum                                                
Schedule of Equity Method Investments [Line Items]                                                
Management fee equity threshold amount                                 1,500,000,000     $ 1,500,000,000        
Fee percent of SAFE Equity between $1.5 billion and $3.0 billion                                                
Schedule of Equity Method Investments [Line Items]                                                
Management fee as percent of equity                                       1.25%        
Fee percent of SAFE Equity between $1.5 billion and $3.0 billion | Maximum                                                
Schedule of Equity Method Investments [Line Items]                                                
Management fee equity threshold amount                                 3,000,000,000.0     $ 3,000,000,000.0        
Fee percent of SAFE Equity between $1.5 billion and $3.0 billion | Minimum                                                
Schedule of Equity Method Investments [Line Items]                                                
Management fee equity threshold amount                                 1,500,000,000     $ 1,500,000,000        
Fee percent of SAFE Equity between $3.0 billion and $5.0 billion                                                
Schedule of Equity Method Investments [Line Items]                                                
Management fee as percent of equity                                       1.375%        
Fee percent of SAFE Equity between $3.0 billion and $5.0 billion | Maximum                                                
Schedule of Equity Method Investments [Line Items]                                                
Management fee equity threshold amount                                 5,000,000,000.0     $ 5,000,000,000.0        
Fee percent of SAFE Equity between $3.0 billion and $5.0 billion | Minimum                                                
Schedule of Equity Method Investments [Line Items]                                                
Management fee equity threshold amount                                 3,000,000,000.0     $ 3,000,000,000.0        
Fee percent of SAFE Equity over $5.0 billion                                                
Schedule of Equity Method Investments [Line Items]                                                
Management fee as percent of equity                                       1.50%        
Fee percent of SAFE Equity over $5.0 billion | Maximum                                                
Schedule of Equity Method Investments [Line Items]                                                
Management fee equity threshold amount                                 5,000,000,000.0     $ 5,000,000,000.0        
Safehold Inc.                                                
Schedule of Equity Method Investments [Line Items]                                                
Purchase option, purchase price to acquire property                 $ 215,000,000.0                   215,000,000.0          
Purchase option, square feet of future office space development | ft²                 1.1                              
Loan Fund | SAFE                                                
Schedule of Equity Method Investments [Line Items]                                                
Commitment to provide loan to lessee   $ 105,000,000.0     $ 130,000,000.0                                      
Consideration received for loan commitment   $ 5,000,000.0     $ 9,000,000.0                                      
Real estate equity investments                                                
Schedule of Equity Method Investments [Line Items]                                                
Equity method investments                                 $ 1,559,077,000     $ 1,559,077,000   1,230,511,000    
Safehold Inc.                                                
Schedule of Equity Method Investments [Line Items]                                                
Equity interest                                 64.80%     64.80%        
Cash investment in equity method investments                                       $ 10,500,000        
Shares acquired (in shares) | shares                                       200,000        
Average cost per share | $ / shares                                 $ 66.83     $ 66.83        
Amount of loan funded                                             $ 16,100,000  
Income from sales of real estate             $ 0                                  
Consideration received             22,100,000                                  
Safehold Inc. | Private Placement                                                
Schedule of Equity Method Investments [Line Items]                                                
Cash investment in equity method investments       $ 191,200,000                                        
Shares acquired (in shares) | shares       3,240,000                                        
Safehold Inc. | Real estate equity investments                                                
Schedule of Equity Method Investments [Line Items]                                                
Voting power cap threshold                                               41.90%
Equity method investments                                 $ 1,459,476,000     $ 1,459,476,000   $ 1,168,532,000    
Multifamily Development San Jose                                                
Schedule of Equity Method Investments [Line Items]                                                
Lessor, operating lease, term of contract (in years)                               99 years                
Leasehold improvement allowance, Ground Leases                               $ 7,200,000                
Proceeds from sale of ground lease                       $ 34,000,000.0                        
Multifamily Development San Jose | Leasehold First Mortgage                                                
Schedule of Equity Method Investments [Line Items]                                                
Commitment to provide loan to lessee                               80,500,000                
Carrying value of loans                               $ 80,500,000                
Other Real Estate Equity Investment January 2021                                                
Schedule of Equity Method Investments [Line Items]                                                
Equity interest                     53.00%                          
Equity method investments                     $ 63,300,000                          
Recognized gain or loss                     $ 0                          
Other Real Estate Equity Investment September 2021                                                
Schedule of Equity Method Investments [Line Items]                                                
Cash investment in equity method investments             2,700,000                                  
Commitment to provide loan to lessee             75,000,000.0                     $ 75,000,000.0     $ 75,000,000.0      
Multi-Family Project                                                
Schedule of Equity Method Investments [Line Items]                                                
Commitment to provide loan to lessee                                             $ 75,000,000.0  
Income from sales of real estate             0                                  
Consideration received             $ 2,700,000                                  
Hotel Property                                                
Schedule of Equity Method Investments [Line Items]                                                
Percentage ownership sold     50.00%                                          
Commitment to provide loan to lessee                   $ 50,000,000.0                            
Equity method investments     $ 4,400,000                                          
Value of land acquired in exchange     9,000,000.0                                          
Gain on disposal of equity method investment exchanged for land     4,600,000                                          
Consideration received                   $ 1,900,000                            
Recognized gain or loss               $ 0                                
Hotel Property | SAFE                                                
Schedule of Equity Method Investments [Line Items]                                                
Proceeds from sale of ground lease     9,000,000.0                                          
Gain (loss) from sale of ground lease     $ 0                                          
Ground Lease, Honolulu, Hawaii [Member] | iStar Net Lease II LLC (Net Lease Venture II)                                                
Schedule of Equity Method Investments [Line Items]                                                
Lessor, operating lease, term of contract (in years)                         99 years                      
Land Parcel One | Maximum                                                
Schedule of Equity Method Investments [Line Items]                                                
Leasehold improvement allowance, Ground Leases                 $ 83,000,000.0                   83,000,000.0          
Land Parcel Two | Maximum                                                
Schedule of Equity Method Investments [Line Items]                                                
Leasehold improvement allowance, Ground Leases                 $ 83,000,000                   $ 83,000,000