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Significant Accounting Policies - Derivative Financial Instruments (Details)
€ in Millions, $ in Millions
Mar. 31, 2020
EUR (€)
DerivativeInstrument
Mar. 31, 2020
USD ($)
DerivativeInstrument
Dec. 31, 2019
EUR (€)
DerivativeInstrument
Dec. 31, 2019
USD ($)
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   $ 10.1   $ (10.6)
Amount expected to be reclassified from accumulated other comprehensive loss to earnings within the next year   1.2    
Gross accumulated other comprehensive income related to derivative activities   $ 60.3   $ 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   50.0  
Forward contract net, fair value   $ 2.9   1.5
Euro:USD currency forward contract | June 18, 2020 | Net Investment Hedging | Designated as Hedging Instrument        
Derivative Financial Instruments        
Notional Amount | € 100.0   100.0  
Forward contract net, fair value   2.2   (0.6)
Euro:USD currency forward contract | June 18, 2020 | Net Investment Hedging | Designated as Hedging Instrument        
Derivative Financial Instruments        
Notional Amount | € 90.0   90.0  
Forward contract net, fair value   2.0   (0.5)
Euro:USD currency forward contract | June 18, 2020 | 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 | June 18, 2020 | 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 | September 23, 2020 | 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 | September 23, 2020 | Net Investment Hedging | Designated as Hedging Instrument        
Derivative Financial Instruments        
Notional Amount | € 30.0      
Forward contract net, fair value   (0.1)    
Euro:USD currency forward contract | September 23, 2020 | Net Investment Hedging | Designated as Hedging Instrument        
Derivative Financial Instruments        
Notional Amount | € 10.0      
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   2.9   (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   2.9   (0.6)
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   3.3   1.3
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   2.3    
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   2.4    
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   1.1    
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   $ 17.8   14.7
Simon Property Group, L.P.        
Derivative Financial Instruments        
Gross accumulated other comprehensive income related to derivative activities   $ 69.3   $ 47.5