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Summary of Significant Accounting Policies - Derivative Financial Instruments (Details)
€ in Millions, $ in Millions
6 Months Ended
Jun. 30, 2024
USD ($)
Y
€ / shares
DerivativeInstrument
Jun. 30, 2023
USD ($)
Jun. 30, 2024
EUR (€)
Y
€ / shares
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 $ 39.0     $ 41.9  
Amount expected to be reclassified from accumulated other comprehensive loss to earnings within the next year 5.3        
Gross accumulated other comprehensive income (loss) related to derivative activities 84.5     48.7  
Gains (losses) of cumulative translation adjustment 60.7 $ (36.7)      
Exchange traded option | Option pricing model          
Derivative Financial Instruments          
Forward contract net, fair value 35.5     28.4  
Interest Rate Swap [Member] | Deferred costs and other assets          
Derivative Financial Instruments          
Interest rate derivative assets, fair value $ 36.3     $ 11.6  
US denominated interest rate swap          
Derivative Financial Instruments          
Number of Instruments | DerivativeInstrument 5   5 5 5
Notional Amount $ 805.0     $ 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   25.0
Forward contract net, fair value $ 1.7     0.7  
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 0.6     (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 0.6     (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 0.9     (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 0.7        
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 1.4        
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 1.5        
Simon Property Group, L.P.          
Derivative Financial Instruments          
Gross accumulated other comprehensive income (loss) related to derivative activities $ 97.2     $ 56.1  
Klepierre | Exchange traded option | Option pricing model | Stock price          
Derivative Financial Instruments          
Derivative liability measurement input | € / shares 24.98   24.98 24.68 24.68
Klepierre | Exchange traded option | Option pricing model | Implied volatility          
Derivative Financial Instruments          
Derivative liability measurement input 19.81   19.81 17.88 17.88
Klepierre | Exchange traded option | Option pricing model | EUR risk-free rate          
Derivative Financial Instruments          
Derivative liability measurement input 3.01   3.01 2.11 2.11
Klepierre | Exchange traded option | Option pricing model | Expected dividend yield          
Derivative Financial Instruments          
Derivative liability measurement input 6.77   6.77 6.85 6.85
Klepierre | Exchange traded option | Option pricing model | Expected term          
Derivative Financial Instruments          
Derivative liability measurement input | Y 2.38   2.38 2.88 2.88
Klepierre | Exchange traded option | Option pricing model | Credit Spread          
Derivative Financial Instruments          
Derivative liability measurement input 0.79   0.79 0.84 0.84