Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(2)
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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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-Publisher FASB
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Long-Term Debt Interest Rates (Details) $ in Thousands, € in Millions	2 Months Ended	3 Months Ended		12 Months Ended
	Feb. 28, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2017 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 18, 2014	Dec. 08, 2014	Nov. 24, 2014	Dec. 10, 2010
Debt Instrument [Line Items]
Repayments of long-term debt				$ 0	$ 778,209	$ 1,252,302
September 2015 Term Loan Agreement
Debt Instrument [Line Items]
Repayments of long-term debt						$ 1,250,000
1.875% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs				$ 2,841	$ 3,971
Debt instrument, interest rate		1.875%	1.875%	1.875%	1.875%		1.875%	1.875%
3.00% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs				$ 0	$ 0
Debt instrument, interest rate		3.00%	3.00%	3.00%	3.00%				3.00%
4.15% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs				$ 2,884	$ 3,372
Debt instrument, interest rate				4.15%	4.15%				4.15%
4.50% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs				$ 589	$ 891
Debt instrument, interest rate		4.50%	4.50%	4.50%	4.50%					4.50%
5.45% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs				$ 4,004	$ 4,159
Debt instrument, interest rate				5.45%	5.45%				5.45%
Senior Notes \| 1.875% Senior Notes
Debt Instrument [Line Items]
Repayments of long-term debt \| €			€ 307.0
Senior Notes \| 3.00% Senior Notes
Debt Instrument [Line Items]
Repayments of long-term debt	$ 250,000
Senior Notes \| 4.50% Senior Notes
Debt Instrument [Line Items]
Repayments of long-term debt		$ 174,700