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Financial Instruments - Derivatives (Details) € in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 EUR (€)
Derivatives, Fair Value [Line Items]
Gain (loss) on net investment hedges, gross	$ (119,298)	$ 22,449	$ 45,230
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	26,957	(4,714)	(9,498)
Gain (loss) on net investment hedges, net of tax	(92,341)	17,735	$ 35,732
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	173,674	179,580
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	73,755	79,707
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value - Asset	2,325	2,892
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Fair Value - Liability	$ 2,057	$ 476
Note due 2026 [Member]
Derivatives, Fair Value [Line Items]
Face amount of notes | €				€ 600,000
Note due 2027 [Member]
Derivatives, Fair Value [Line Items]
Face amount of notes | €				€ 500,000

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Current period adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount, after tax, of reclassification from accumulated other comprehensive income (AOCI) of gain (loss) from increase (decrease) in fair value of net investment hedge.

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