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Significant Accounting Policies - Derivative Financial Instruments (Details)
€ in Millions, $ in Millions
6 Months Ended
Jun. 30, 2023
USD ($)
DerivativeInstrument
Jun. 30, 2022
USD ($)
Jun. 30, 2023
EUR (€)
DerivativeInstrument
Dec. 31, 2022
USD ($)
DerivativeInstrument
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 $ 21.5     $ 10.9  
Amount expected to be reclassified from accumulated other comprehensive loss to earnings within the next year 2.4        
Gross accumulated other comprehensive income (loss) related to derivative activities 53.8     36.5  
Gains (losses) of cumulative translation adjustment (36.7) $ 176.9      
Interest rate swap | Deferred costs and other assets          
Derivative Financial Instruments          
Interest rate derivative liabilities, fair value 27.3     13.1  
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 | July 19, 2023 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €     € 25.0    
Forward contract net, fair value (0.1)        
Euro-USD currency forward contract | September 15, 2023 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €     44.0   44.0
Forward contract net, fair value (0.5)     (0.1)  
Euro-USD currency forward contract | September 15, 2023 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €     30.0    
Forward contract net, fair value (0.4)        
Euro-USD currency forward contract | December 15, 2023 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €     50.0   50.0
Forward contract net, fair value (3.3)     (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 (0.2)        
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 (3.4)     $ (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)        
USD | Interest rate swap          
Derivative Financial Instruments          
Number of Instruments | DerivativeInstrument 4   4    
Notional Amount $ 538.0        
Euro | Interest rate swap          
Derivative Financial Instruments          
Number of Instruments | DerivativeInstrument 3   3 1 1
Notional Amount | €     € 878.0   € 128.0
Euro | Interest rate cap          
Derivative Financial Instruments          
Number of Instruments | DerivativeInstrument 3   3 5 5
Notional Amount | €     € 123.3   € 319.0
Simon Property Group, L.P.          
Derivative Financial Instruments          
Gross accumulated other comprehensive income (loss) related to derivative activities $ 61.6     $ 41.8