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Fair Value Measurements and Derivative Instruments (Narrative) (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Derivative [Line Items]    
Percentage of securities in loss position 30.00%  
Time deposits $ 25,000,000 $ 383,000,000
Foreign exchange contracts    
Derivative [Line Items]    
Derivative notional amount 9,000,000 $ 7,000,000
Interest rate swaps    
Derivative [Line Items]    
Derivative notional amount $ 500,000,000