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Summary of Significant Accounting Policies - Derivative Financial Instruments (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
€ / shares
Y
DerivativeInstrument
Dec. 31, 2022
USD ($)
DerivativeInstrument
Dec. 31, 2021
USD ($)
Dec. 31, 2023
EUR (€)
€ / shares
Y
DerivativeInstrument
Nov. 14, 2023
USD ($)
€ / shares
Y
Dec. 31, 2022
EUR (€)
DerivativeInstrument
Derivative Financial Instruments            
Number of credit-risk-related hedging or derivative activities | DerivativeInstrument 0     0    
Unamortized gain on treasury locks and terminated hedges $ 41.9 $ 10.9        
Amount expected to be reclassified from accumulated other comprehensive loss to earnings within the next year 3.1          
Gross accumulated other comprehensive income (loss) related to derivative activities 48.7 36.5        
Gains (losses) of cumulative translation adjustment (45.2) 131.7 $ 176.0      
Exchange traded option | Option pricing model            
Derivative Financial Instruments            
Forward contract net, fair value 28.4       $ 19.2  
Interest rate swap | Deferred costs and other assets            
Derivative Financial Instruments            
Interest rate net, fair value $ 11.6 $ 13.1        
US denominated interest rate swap            
Derivative Financial Instruments            
Number of Instruments | DerivativeInstrument 5     5    
Notional Amount $ 805.0          
Euro denominated interest rate swap            
Derivative Financial Instruments            
Number of Instruments | DerivativeInstrument 1 1   1   1
Notional Amount | €       € 128.0   € 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 3 5   3   5
Notional Amount | €       € 129.0   € 319.0
Euro-USD currency forward contract | January 13, 2023 | Net Investment Hedging | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €           50.0
Forward contract net, fair value   $ (2.9)        
Euro-USD currency forward contract | March 15, 2023 | Net Investment Hedging | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €           15.0
Forward contract net, fair value   0.7        
Euro-USD currency forward contract | March 15, 2023. | Net Investment Hedging | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €           15.0
Forward contract net, fair value   0.7        
Euro-USD currency forward contract | April 12, 2023 | Net Investment Hedging | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €           45.0
Forward contract net, fair value   (0.2)        
Euro-USD currency forward contract | September 15, 2023 | Net Investment Hedging | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €           44.0
Forward contract net, fair value   (0.1)        
Euro-USD currency forward contract | December 15, 2023 | Net Investment Hedging | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €           50.0
Forward contract net, fair value   (2.8)        
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 | December 13, 2024 | Net Investment Hedging | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €       37.0    
Forward contract net, fair value (0.9)          
Euro-USD currency forward contract | December 13, 2024. | Net Investment Hedging | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €       37.0    
Forward contract net, fair value (0.9)          
Euro-USD currency forward contract | March 17, 2025 | Net Investment Hedging | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €       50.0    
Forward contract net, fair value (1.1)          
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 | March 15, 2024 | Net Investment Hedging | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €       30.0   30.0
Forward contract net, fair value 1.0 1.3        
Euro-USD currency forward contract | March 15, 2024. | Net Investment Hedging | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €       51.0   € 51.0
Forward contract net, fair value (3.6) (2.8)        
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)          
Simon Property Group, L.P.            
Derivative Financial Instruments            
Gross accumulated other comprehensive income (loss) related to derivative activities $ 56.1 $ 41.8        
Klepierre | Exchange traded option | Option pricing model | Stock price            
Derivative Financial Instruments            
Derivative liability measurement input | € / shares 24.68     24.68 22.67  
Klepierre | Exchange traded option | Option pricing model | Implied volatility            
Derivative Financial Instruments            
Derivative liability measurement input 0.1788     0.1788 0.1974  
Klepierre | Exchange traded option | Option pricing model | EUR risk-free rate            
Derivative Financial Instruments            
Derivative liability measurement input 0.0211     0.0211 0.0296  
Klepierre | Exchange traded option | Option pricing model | Expected dividend yield            
Derivative Financial Instruments            
Derivative liability measurement input 0.0685     0.0685 0.0743  
Klepierre | Exchange traded option | Option pricing model | Expected term            
Derivative Financial Instruments            
Derivative liability measurement input | Y 2.88     2.88 3.00  
Klepierre | Exchange traded option | Option pricing model | Credit Spread            
Derivative Financial Instruments            
Derivative liability measurement input 0.0084     0.0084 0.0144