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Hedging Activities, Derivative Instruments and Credit Risk - Narrative (Details)
€ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Contract
Dec. 31, 2020
EUR (€)
Contract
Dec. 31, 2019
USD ($)
Derivatives, Fair Value [Line Items]      
Off-balance sheet derivative instruments $ 0   $ 0
LIBOR      
Derivatives, Fair Value [Line Items]      
Outstanding borrowing $ 3,204,400,000 € 596.7  
Interest rate swap contracts      
Derivatives, Fair Value [Line Items]      
Number of instruments held | Contract 0 0  
Foreign currency forwards      
Derivatives, Fair Value [Line Items]      
Number of instruments held | Contract 10 10  
Foreign currency forwards | Minimum      
Derivatives, Fair Value [Line Items]      
Notional amount of derivative $ 10,300,000    
Foreign currency forwards | Maximum      
Derivatives, Fair Value [Line Items]      
Term of derivative contract 1 year    
Notional amount of derivative $ 79,500,000