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Financial Instruments - Foreign Exchange Risk (Details)	3 Months Ended
Financial Instruments - Foreign Exchange Risk (Details)	Mar. 31, 2021
Derivatives Not Designated as Hedging Instruments \| Foreign currency forward-exchange contracts
Derivative [Line Items]
Maturity period (in years)	60 days
Derivatives Not Designated as Hedging Instruments \| Maximum \| Foreign currency forward-exchange contracts
Derivative [Line Items]
Maturity period (in years)	3 years
Derivatives Designated as Hedging Instruments: \| Maximum \| Cross-currency interest rate swap contracts
Derivative [Line Items]
Maturity period (in years)	5 years