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Summary of Significant Accounting Policies - Derivative Financial Instruments (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
EUR (€)
DerivativeInstrument
Dec. 31, 2019
USD ($)
DerivativeInstrument
Dec. 31, 2018
EUR (€)
DerivativeInstrument
Dec. 31, 2018
USD ($)
DerivativeInstrument
Derivative Financial Instruments            
Number of credit-risk-related hedging or derivative activities | DerivativeInstrument     0 0    
Unamortized gain (loss) on treasury locks and terminated hedges $ 10.6 $ (3.0)        
Amount expected to be reclassified from accumulated other comprehensive loss to earnings within the next year       $ 1.9    
Gross accumulated other comprehensive income related to derivative activities       $ 41.2   $ 32.9
Interest rate swap | Designated as Hedging Instrument            
Derivative Financial Instruments            
Number of Instruments | DerivativeInstrument     0 0 0 0
Euro:USD currency forward contract | May 15, 2019 | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €         € 50.0  
Forward contract net, fair value           $ (0.8)
Euro:USD currency forward contract | March 20, 2020 | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €     € 50.0      
Forward contract net, fair value       $ (0.5)    
Euro:USD currency forward contract | March 20, 2020 | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €     50.0      
Forward contract net, fair value       (0.5)    
Euro:USD currency forward contract | March 20, 2020 | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €     50.0      
Forward contract net, fair value       (0.5)    
Euro:USD currency forward contract | May 15, 2020 | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €     50.0   50.0  
Forward contract net, fair value       1.5   (1.5)
Euro:USD currency forward contract | June 18, 2020 | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €     100.0      
Forward contract net, fair value       (0.6)    
Euro:USD currency forward contract | June 18, 2020 | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €     90.0      
Forward contract net, fair value       (0.5)    
Euro:USD currency forward contract | December 18, 2020 | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €     100.0      
Forward contract net, fair value       (0.6)    
Euro:USD currency forward contract | December 18, 2020 | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €     100.0      
Forward contract net, fair value       (0.6)    
Euro:USD currency forward contract | May 14, 2021 | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €     € 50.0   € 50.0  
Forward contract net, fair value       1.3   (2.0)
US denominated cross currency swap | Net Investment Hedging | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount       $ 150.0    
Swapping interest rate     4.38% 4.38%    
Euro denominated cross currency swap | Net Investment Hedging | Designated as Hedging Instrument            
Derivative Financial Instruments            
Notional Amount | €     € 121.6      
Fixed exchange rate     1.37% 1.37%    
Euro denominated cross currency swap | Deferred costs and other assets | Net Investment Hedging | Designated as Hedging Instrument            
Derivative Financial Instruments            
Interest rate derivative asset, fair value       $ 14.7   10.9
Simon Property Group, L.P.            
Derivative Financial Instruments            
Gross accumulated other comprehensive income related to derivative activities       $ 47.5   $ 37.9