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Significant Accounting Policies - Derivative Financial Instruments (Details)
€ in Millions, $ in Millions
Mar. 31, 2021
USD ($)
DerivativeInstrument
Mar. 31, 2021
EUR (€)
DerivativeInstrument
Dec. 31, 2020
USD ($)
DerivativeInstrument
Dec. 31, 2020
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 $ 8.2   $ 8.7  
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 $ (22.3)   $ (53.2)  
Interest rate swap | Designated as Hedging Instrument        
Derivative Financial Instruments        
Number of Instruments | DerivativeInstrument 0 0 0 0
Euro:USD currency forward contract | March 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
Forward contract net, fair value     (2.1)  
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     (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   60.0
Forward contract net, fair value $ (1.1)   (4.2)  
Euro:USD currency forward contract | December 20, 2021 | Net Investment Hedging | Designated as Hedging Instrument        
Derivative Financial Instruments        
Notional Amount | €   60.0   60.0
Forward contract net, fair value (1.0)   (4.1)  
Euro:USD currency forward contract | December 20, 2021 | Net Investment Hedging | Designated as Hedging Instrument        
Derivative Financial Instruments        
Notional Amount | €   30.0   30.0
Forward contract net, fair value (0.7)   (2.2)  
Euro:USD currency forward contract | July 15, 2021 | Net Investment Hedging | Designated as Hedging Instrument        
Derivative Financial Instruments        
Notional Amount | €   50.0   50.0
Forward contract net, fair value 2.5   (0.1)  
Euro:USD currency forward contract | July 15, 2021 | Net Investment Hedging | Designated as Hedging Instrument        
Derivative Financial Instruments        
Notional Amount | €   41.0   41.0
Forward contract net, fair value 2.1   (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 | September 17, 2021 | Net Investment Hedging | Designated as Hedging Instrument        
Derivative Financial Instruments        
Notional Amount | €   61.0   61.0
Forward contract net, fair value 1.9   (1.3)  
Euro:USD currency forward contract | September 17, 2021 | Net Investment Hedging | Designated as Hedging Instrument        
Derivative Financial Instruments        
Notional Amount | €   € 61.0   € 61.0
Forward contract net, fair value 1.9   (1.2)  
Simon Property Group, L.P.        
Derivative Financial Instruments        
Gross accumulated other comprehensive income (loss) related to derivative activities $ (25.5)   $ (60.9)