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Summary of Significant Accounting Policies - Derivative Financial Instruments (Details)
€ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
DerivativeInstrument
Dec. 31, 2020
EUR (€)
DerivativeInstrument
Dec. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
DerivativeInstrument
Dec. 31, 2019
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 $ 8.7     $ 10.6  
Amount expected to be reclassified from accumulated other comprehensive loss to earnings within the next year 1.0        
Gross accumulated other comprehensive income (loss) related to derivative activities $ (53.2)     $ 41.2  
Interest rate swap | Designated as Hedging Instrument          
Derivative Financial Instruments          
Number of Instruments | DerivativeInstrument 0 0   0 0
Euro:USD currency forward contract | March 20, 2020 | Net Investment Hedging | 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 | Net Investment Hedging | 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 | Net Investment Hedging | 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 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €         50.0
Forward contract net, fair value       1.5  
Euro:USD currency forward contract | June 18, 2020 | Net Investment Hedging | 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 | Net Investment Hedging | 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 | Net Investment Hedging | 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 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €         100.0
Forward contract net, fair value       (0.6)  
Euro:USD currency forward contract | March 24, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   € 100.0      
Forward contract net, fair value $ (3.9)        
Euro:USD currency forward contract | March 24, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   100.0      
Forward contract net, fair value (3.8)        
Euro:USD currency forward contract | March 24, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   50.0      
Forward contract net, fair value (2.3)        
Euro:USD currency forward contract | March 24, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   50.0      
Forward contract net, fair value (2.2)        
Euro:USD currency forward contract | May 14, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   50.0      
Forward contract net, fair value (2.2)        
Euro:USD currency forward contract | May 14, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   50.0      
Forward contract net, fair value (2.2)        
Euro:USD currency forward contract | May 14, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   41.0      
Forward contract net, fair value (1.9)        
Euro:USD currency forward contract | May 14, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   20.0      
Forward contract net, fair value (1.7)        
Euro:USD currency forward contract | May 14, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   50.0     € 50.0
Forward contract net, fair value (2.1)     1.3  
Euro:USD currency forward contract | May 14, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   50.0      
Forward contract net, fair value (6.4)        
Euro:USD currency forward contract | May 14, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   30.0      
Forward contract net, fair value (2.6)        
Euro:USD currency forward contract | December 20, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   60.0      
Forward contract net, fair value (4.2)        
Euro:USD currency forward contract | December 20, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   60.0      
Forward contract net, fair value (4.1)        
Euro:USD currency forward contract | December 20, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   30.0      
Forward contract net, fair value (2.2)        
Euro:USD currency forward contract | July 15, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   50.0      
Forward contract net, fair value (0.1)        
Euro:USD currency forward contract | July 15, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   50.0      
Forward contract net, fair value (0.1)        
Euro:USD currency forward contract | July 15, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   50.0      
Forward contract net, fair value (0.1)        
Euro:USD currency forward contract | July 15, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   50.0      
Euro:USD currency forward contract | July 15, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   50.0      
Euro:USD currency forward contract | September 17, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   61.0      
Forward contract net, fair value (1.3)        
Euro:USD currency forward contract | September 17, 2021 | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Financial Instruments          
Notional Amount | €   € 61.0      
Forward contract net, fair value (1.2)        
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          
Fair value of cross currency     $ 4.1 14.7  
Simon Property Group, L.P.          
Derivative Financial Instruments          
Gross accumulated other comprehensive income (loss) related to derivative activities $ (60.9)     $ 47.5