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Equity - Common Stock and Unit Issuances and Repurchases (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 29, 2020
shares
Nov. 18, 2020
USD ($)
$ / shares
shares
Feb. 11, 2019
USD ($)
Sep. 25, 2018
shares
Feb. 13, 2017
USD ($)
Dec. 31, 2020
USD ($)
item
$ / shares
shares
Dec. 31, 2019
USD ($)
item
$ / shares
shares
Dec. 31, 2018
shares
Equity                
Minimum number of additional classes or series of common stock that the Board is authorized to reclassify from excess common stock | item           1    
Exchange of limited partner units, (in shares)           293,204 24,000 92,732
Public offering of common stock, shares   22,137,500       22,137,500    
Proceeds from issuance of common stock | $   $ 1,600.0            
Share Price | $ / shares   $ 72.50            
Period common stock is authorized to repurchase     2 years   2 years      
Common stock authorized for repurchase | $     $ 2,000.0   $ 2,000.0      
Shares repurchased (in shares)           1,245,654 2,247,074 2,275,194
Average share price repurchased (in dollars per share) | $ / shares           $ 122.50 $ 160.11  
2017 Share Repurchase Program                
Equity                
Shares repurchased (in shares)             46,377  
Average share price repurchased (in dollars per share) | $ / shares             $ 164.49  
Simon Property Group, L.P.                
Equity                
Redemption of units           116,658 43,255 454,704
Public offering of common stock, shares           22,137,500    
TRG                
Equity                
Ownership interest acquired (as a percent) 80.00%              
TRG | Simon Property Group, L.P.                
Equity                
Number of units issued in connection with acquisition 955,705              
Outlets at Orange                
Equity                
Ownership interests acquired (as a percent)       50.00%        
Outlets at Orange | Simon Property Group, L.P.                
Equity                
Number of units issued in connection with acquisition       475,183        
Class B common stock                
Equity                
Common Stock, Shares, Outstanding           8,000 8,000  
Number of voting trusts which are subject to outstanding shares common stock | item           2    
Common Stock                
Equity                
Number of votes entitled per share to holders of common stock | item           1    
Limited Partners                
Equity                
Exchange of limited partner units, (in shares)           293,204 24,000  
Number of limited partners who received common stock | item           20    
Limited Partners | Simon Property Group, L.P.                
Equity                
Redemption of units           116,658 43,255  
Value of units redeemed | $           $ 16.1 $ 6.8  
Number of limited partners who received common stock | item           4 9  
Maximum | Class B common stock                
Equity                
Number of members of board of directors elected under entitlement of right | item           4