Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total long-term Debt	$ 3,538,392	$ 3,050,257
Current portion of long-term debt	406,201	187,336
Long-term debt	$ 3,132,191	2,862,921
1.875% Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate	1.875%
Unsecured debt \| 1.125% Notes
Debt Instrument [Line Items]
Total long-term Debt	$ 556,697	$ 549,241
Debt instrument, interest rate	1.125%	1.125%
Unamortized discount and debt issuance costs	$ 4,203	$ 5,659
Unsecured debt \| 1.625% Notes
Debt Instrument [Line Items]
Total long-term Debt	$ 555,053	$ 549,204
Debt instrument, interest rate	1.625%	1.625%
Unamortized discount and debt issuance costs	$ 5,847	$ 5,696
Unsecured debt \| Floating Rate Notes
Debt Instrument [Line Items]
Total long-term Debt	199,098	198,831
Unamortized debt issuance costs	902	1,169
Senior notes \| 1.875% Senior Notes
Debt Instrument [Line Items]
Total long-term Debt	$ 439,415	$ 434,241
Debt instrument, interest rate	1.875%	1.875%
Unamortized discount and debt issuance costs	$ 1,372	$ 1,831
Senior notes \| 3.45% Senior Notes
Debt Instrument [Line Items]
Total long-term Debt	$ 296,772	$ 296,467
Debt instrument, interest rate	3.45%	3.45%
Unamortized discount and debt issuance costs	$ 3,228	$ 3,533
Senior notes \| 4.15% Senior Notes
Debt Instrument [Line Items]
Total long-term Debt	$ 422,846	$ 422,603
Debt instrument, interest rate	4.15%	4.15%
Unamortized discount and debt issuance costs	$ 2,154	$ 2,398
Senior notes \| 5.45% Senior Notes
Debt Instrument [Line Items]
Total long-term Debt	$ 346,228	$ 346,150
Debt instrument, interest rate	5.45%	5.45%
Unamortized discount and debt issuance costs	$ 3,772	$ 3,850
Credit facilities
Debt Instrument [Line Items]
Total long-term Debt	455,609	0
Commercial paper notes
Debt Instrument [Line Items]
Total long-term Debt	200,000	186,700
Variable-rate foreign bank loans
Debt Instrument [Line Items]
Total long-term Debt	7,462	7,296
Finance lease obligations
Debt Instrument [Line Items]
Total long-term Debt	$ 59,212	$ 59,524

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