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Fair Value Measurements and Derivative Instruments (Narrative) (Details) - USD ($)
1 Months Ended
May 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Derivative [Line Items]      
Percentage of securities in loss position   35.00%  
Held-to-maturity securities   $ 19,000,000 $ 75,000,000
Foreign exchange contracts      
Derivative [Line Items]      
Derivative notional amount   2,000,000 $ 8,000,000
Interest rate swaps      
Derivative [Line Items]      
Derivative notional amount $ 500,000,000 $ 200,000,000  
Gain (loss) on sale of derivatives $ 2,000,000