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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Debt Facilities - Senior Notes (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Apr. 02, 2018	Mar. 14, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long term debt, gross	$ 1,405,798			$ 1,466,224
Add amount representing unamortized debt premium	1,926			2,051
Total long term debt	9,949,924
Senior Notes [Member]
Debt Instrument [Line Items]
Long term debt, gross	8,542,200			7,002,000
Unamortized debt issuance costs	(78,961)			(78,151)
Add amount representing unamortized debt premium	6,100			0
Debt, unamortized discount (premium) and debt issuance costs, net	8,469,339			6,923,849
Less current portion	(150,557)			0
Total long term debt	$ 8,318,782			6,923,849
Senior Notes [Member] \| 5.000% Infomart Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.00%	5.00%
Long term debt, gross	$ 750,000			$ 0
Effective interest rate	4.40%			0.00%
Add amount representing unamortized debt premium		$ 8,200
Senior Notes [Member] \| 5.375% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.375%
Long term debt, gross	$ 750,000			$ 750,000
Effective interest rate	5.56%			5.56%
Senior Notes [Member] \| 5.375% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.375%
Long term debt, gross	$ 1,000,000			$ 1,000,000
Effective interest rate	5.51%			5.51%
Senior Notes [Member] \| 2.875% Euro Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	2.875%		2.875%
Long term debt, gross	$ 870,600			$ 0
Effective interest rate	3.08%			0.00%
Unamortized debt issuance costs			$ (11,600)
Senior Notes [Member] \| 5.750% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.75%
Long term debt, gross	$ 500,000			$ 500,000
Effective interest rate	5.88%			5.88%
Senior Notes [Member] \| 2.875% Euro Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	2.875%
Long term debt, gross	$ 1,160,800			$ 1,201,000
Effective interest rate	3.04%			3.04%
Senior Notes [Member] \| 5.875% Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.875%
Long term debt, gross	$ 1,100,000			$ 1,100,000
Effective interest rate	6.03%			6.03%
Senior Notes [Member] \| 2.875% Euro Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	2.875%
Long term debt, gross	$ 1,160,800			$ 1,201,000
Effective interest rate	3.04%			3.04%
Senior Notes [Member] \| 5.375% Senior Notes due 2027 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.375%
Long term debt, gross	$ 1,250,000			$ 1,250,000
Effective interest rate	5.51%			5.51%