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Significant Accounting Policies - Derivative Financial Instruments (Details)
€ in Millions, $ in Millions
Sep. 30, 2020
USD ($)
DerivativeInstrument
Sep. 30, 2020
EUR (€)
DerivativeInstrument
Dec. 31, 2019
USD ($)
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 $ 9.1   $ 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 related to derivative activities $ (4.3)   $ 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 | €   € 50.0    
Forward contract net, fair value $ (2.1)      
Euro:USD currency forward contract | December 18, 2020 | Net Investment Hedging | Designated as Hedging Instrument        
Derivative Financial Instruments        
Notional Amount | €   100.0   100.0
Forward contract net, fair value (3.4)   (0.6)  
Euro:USD currency forward contract | December 18, 2020 | Net Investment Hedging | Designated as Hedging Instrument        
Derivative Financial Instruments        
Notional Amount | €   100.0   100.0
Forward contract net, fair value (3.4)   (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 0.8      
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 0.9      
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 0.1      
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 0.1      
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 0.1      
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 0.1      
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 0.1      
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 (0.8)      
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 0.2   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 (4.0)      
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 (1.1)      
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 (1.4)      
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 (1.3)      
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 (0.8)      
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 $ 8.0   14.7  
Simon Property Group, L.P.        
Derivative Financial Instruments        
Gross accumulated other comprehensive income related to derivative activities $ (5.0)   $ 47.5