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Summary of Significant Accounting Policies - Derivative Financial Instruments (Details)
€ in Millions, $ in Millions
9 Months Ended
Sep. 30, 2024
USD ($)
€ / shares
Y
DerivativeInstrument
Sep. 30, 2023
USD ($)
Sep. 30, 2024
EUR (€)
€ / shares
Y
DerivativeInstrument
Dec. 31, 2023
USD ($)
Y
€ / shares
DerivativeInstrument
Dec. 31, 2023
EUR (€)
Y
€ / shares
DerivativeInstrument
Derivative Financial Instruments          
Number of credit-risk-related hedging or derivative activities | DerivativeInstrument 0   0    
Unamortized gain on treasury locks and terminated hedges $ 42.3     $ 41.9  
Amount expected to be reclassified from accumulated other comprehensive loss to earnings within the next year 5.9        
Gains (losses) of cumulative translation adjustment 21.9 $ 23.8      
Gross accumulated other comprehensive income (loss) related to derivative activities 36.2     48.7  
Exchange traded option | Option pricing model          
Derivative Financial Instruments          
Forward contract net, fair value 101.1     28.4  
Interest rate swap | Deferred costs and other assets          
Derivative Financial Instruments          
Interest rate derivative assets, fair value $ 2.5     $ 11.6  
US denominated interest rate swap          
Derivative Financial Instruments          
Number of Instruments | DerivativeInstrument 3   3 5 5
Notional Amount $ 430.0     $ 805.0  
Euro denominated interest rate swap          
Derivative Financial Instruments          
Number of Instruments | DerivativeInstrument 2   2 1 1
Notional Amount | €     € 193.0   € 128.0
US denominated interest rate cap          
Derivative Financial Instruments          
Number of Instruments | DerivativeInstrument       1 1
Notional Amount       $ 38.0  
Euro denominated interest rate cap          
Derivative Financial Instruments          
Number of Instruments | DerivativeInstrument 2   2 3 3
Notional Amount | €     € 80.0   € 129.0
Euro-USD currency forward contract | January 17, 2024 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €         50.0
Forward contract net, fair value       $ (0.4)  
Euro-USD currency forward contract | March 15, 2024 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €         30.0
Forward contract net, fair value       1.0  
Euro-USD currency forward contract | March 15, 2024 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €         51.0
Forward contract net, fair value       (3.6)  
Euro-USD currency forward contract | April 12, 2024 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €         20.0
Forward contract net, fair value       (0.1)  
Euro-USD currency forward contract | July 17, 2024 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €         25.0
Forward contract net, fair value       0.7  
Euro-USD currency forward contract | November 21, 2024 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €     25.0    
Forward contract net, fair value $ (0.2)        
Euro-USD currency forward contract | December 13, 2024 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €     37.0   37.0
Forward contract net, fair value (0.7)     (0.9)  
Euro-USD currency forward contract | December 13, 2024 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €     37.0   37.0
Forward contract net, fair value (0.7)     (0.9)  
Euro-USD currency forward contract | March 17, 2025 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €     50.0   € 50.0
Forward contract net, fair value (0.8)     (1.1)  
Euro-USD currency forward contract | March 17, 2025 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €     27.0    
Forward contract net, fair value (0.2)        
Euro-USD currency forward contract | March 17, 2025 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €     54.0    
Forward contract net, fair value (0.5)        
Euro-USD currency forward contract | April 17, 2025 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €     € 50.0    
Forward contract net, fair value (0.2)        
Simon Property Group, L.P.          
Derivative Financial Instruments          
Gross accumulated other comprehensive income (loss) related to derivative activities $ 41.6     $ 56.1  
Klepierre | Exchange traded option | Option pricing model | Stock price          
Derivative Financial Instruments          
Derivative liability measurement input | € / shares 29.36   29.36 24.68 24.68
Klepierre | Exchange traded option | Option pricing model | Implied volatility          
Derivative Financial Instruments          
Derivative liability measurement input 20.56   20.56 17.88 17.88
Klepierre | Exchange traded option | Option pricing model | EUR risk-free rate          
Derivative Financial Instruments          
Derivative liability measurement input 2.18   2.18 2.11 2.11
Klepierre | Exchange traded option | Option pricing model | Expected dividend yield          
Derivative Financial Instruments          
Derivative liability measurement input 5.79   5.79 6.85 6.85
Klepierre | Exchange traded option | Option pricing model | Expected term          
Derivative Financial Instruments          
Derivative liability measurement input | Y 2.12   2.12 2.88 2.88
Klepierre | Exchange traded option | Option pricing model | Credit Spread          
Derivative Financial Instruments          
Derivative liability measurement input 0.64   0.64 0.84 0.84