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Financial Instruments and Fair Value Measurements - Notional Principal Amounts of Outstanding Derivative Instruments (Parenthetical) (Details) - Contract
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Derivatives Fair Value [Line Items]    
Maximum maturity period of outstanding derivatives are not designated as hedging instruments 90 days  
Not Designated as Hedging Instrument | Foreign Exchange-forward Contracts    
Derivatives Fair Value [Line Items]    
Number of outstanding derivatives contracts 0 1