Fair value of the assets less the liabilities of a derivative or group of derivatives.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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Derivatives and Hedging - Balances and Locations of Derivative Instruments (Details) € in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 EUR (€)	Dec. 31, 2018 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Derivative [Line Items]
Balance			$ 1,945,387	$ 1,466,803
Designated as Hedging Instrument \| Other Current Liabilities \| Cash Flow Hedges \| Interest Rate Swap
Derivative [Line Items]
Notional			800,000	500,000
Balance			24,792	6,345
Designated as Hedging Instrument \| Prepaid Expenses and Other Current Assets \| Net Investment Hedges \| Cross-currency swap
Derivative [Line Items]
Notional			0	500,000
Balance			0	6,006
Designated as Hedging Instrument \| Prepaid Expenses and Other Current Assets \| Net Investment Hedges \| Forward contracts
Derivative [Line Items]
Notional			925,810	0
Balance			39,965	0
Designated as Hedging Instrument \| Long-term Debt \| Net Investment Hedges \| Foreign currency debt
Derivative [Line Items]
Notional \| €	€ 700,000	€ 700,000
Balance			$ 784,000	$ 801,010