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Summary of Significant Accounting Policies - Derivative Financial Instruments (Details)
€ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Y
€ / shares
DerivativeInstrument
Dec. 31, 2023
USD ($)
€ / shares
Y
DerivativeInstrument
Mar. 31, 2024
EUR (€)
Y
€ / shares
DerivativeInstrument
Dec. 31, 2023
EUR (€)
€ / shares
Y
DerivativeInstrument
Derivative Financial Instruments        
Number of credit-risk-related hedging or derivative activities | DerivativeInstrument 0   0  
Unamortized gain on treasury locks and terminated hedges $ 40.3 $ 41.9    
Amount expected to be reclassified from accumulated other comprehensive loss to earnings within the next year 5.2      
Gross accumulated other comprehensive income (loss) related to derivative activities 71.5 48.7    
Gains (losses) of cumulative translation adjustment 46.4 32.4    
Exchange traded option | Option pricing model        
Derivative Financial Instruments        
Forward contract net, fair value 30.8 28.4    
Interest rate swap | Deferred costs and other assets        
Derivative Financial Instruments        
Interest rate derivative assets, fair value $ 29.3 $ 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 1 2 1
Notional Amount | €     € 193.0 € 128.0
US denominated interest rate cap        
Derivative Financial Instruments        
Number of Instruments | DerivativeInstrument 1 1 1 1
Notional Amount $ 38.0 $ 38.0    
Euro denominated interest rate cap        
Derivative Financial Instruments        
Number of Instruments | DerivativeInstrument 2 3 2 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 | December 13, 2024 | Net Investment Hedging | Designated as Hedging Instrument        
Derivative Financial Instruments        
Notional Amount | €     37.0 37.0
Forward contract net, fair value $ 0.2 (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 0.2 (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 0.3 (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 0.4      
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 0.8      
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 0.9      
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 1.4 0.7    
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 € 20.0
Forward contract net, fair value 0.5 (0.1)    
Simon Property Group, L.P.        
Derivative Financial Instruments        
Gross accumulated other comprehensive income (loss) related to derivative activities $ 82.2 $ 56.1    
Klepierre | Exchange traded option | Option pricing model | Stock price        
Derivative Financial Instruments        
Derivative liability measurement input | € / shares 24.00 24.68 24.00 24.68
Klepierre | Exchange traded option | Option pricing model | Implied volatility        
Derivative Financial Instruments        
Derivative liability measurement input 18.57 17.88 18.57 17.88
Klepierre | Exchange traded option | Option pricing model | EUR risk-free rate        
Derivative Financial Instruments        
Derivative liability measurement input 2.83 2.11 2.83 2.11
Klepierre | Exchange traded option | Option pricing model | Expected dividend yield        
Derivative Financial Instruments        
Derivative liability measurement input 7.04 6.85 7.04 6.85
Klepierre | Exchange traded option | Option pricing model | Expected term        
Derivative Financial Instruments        
Derivative liability measurement input | Y 2.63 2.88 2.63 2.88
Klepierre | Exchange traded option | Option pricing model | Credit Spread        
Derivative Financial Instruments        
Derivative liability measurement input 0.68 0.84 0.68 0.84