Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The premium (cost) of a hedge, net of any cash received on settlement during the period.

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Amount, after tax, of cumulative translation adjustment attributable to gain (loss) on foreign currency derivatives that are designated as, and are effective as, economic hedges of a net investment in a foreign entity.

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Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

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Derivative Instruments and Hedging Activities (Details) € in Thousands, $ in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 CAD ($)	Jun. 30, 2017 EUR (€)
Derivative instruments
Cash receipts			$ 393,806	$ 322,040
Unrealized gains associated with interest rate swap agreements	$ 2,388		2,203
Net Investment Hedging [Member] \| Designated as Hedging Instrument
Derivative instruments
Derivatives used in Net Investment Hedge, Net of Tax	7,810		7,810
Former Revolving Credit Facility [Member] \| Net Investment Hedging [Member] \| Designated as Hedging Instrument
Derivative instruments
Notional amount of derivatives \| €									€ 73,175
Senior Notes 4.375 Percent due 2021 \| Net Investment Hedging [Member] \| Designated as Hedging Instrument
Derivative instruments
Notional amount of derivatives \| €					€ 179,881
Foreign Exchange Forward - Option One [Member] \| Purchases
Derivative instruments
Notional amount of derivatives						$ 138,823
Foreign Exchange Forward - Option One [Member] \| Sales
Derivative instruments
Derivative, amount of hedged item								$ 176,000
Interest Rate Swap \| Designated as Hedging Instrument
Derivative instruments
Notional amount of derivatives	350,000		350,000
Unrealized gain			2,203
Foreign exchange contracts
Derivative instruments
Net cash receipts (payments)	(7,554)	$ 893	(1,211)	$ 893
Foreign exchange contracts \| Purchases
Derivative instruments
Notional amount of derivatives \| €					93,000		€ 135,000
Foreign exchange contracts \| Sales
Derivative instruments
Derivative, amount of hedged item	112,315		112,315			160,757
Foreign Exchange Forward - Option Two [Member] \| Purchases
Derivative instruments
Notional amount of derivatives	68,015		68,015			$ 114,390
Foreign Exchange Forward - Option Two [Member] \| Sales
Derivative instruments
Derivative, amount of hedged item \| €					€ 58,000		€ 96,150
Other Long-Term Liabilities \| Interest Rate Swap
Derivative instruments
Derivative liability	$ 2,203		$ 2,203