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Long-Term Debt Schedule of Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 25, 2019 | Dec. 18, 2014 | Dec. 08, 2014 | Nov. 24, 2014
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt | $ 3,572,058 | $ 3,050,257 |  |  |  |
Unamortized discount and debt issuance costs | (20,332) | (24,136) |  |  |  |
Current portion of long-term debt | 804,677 | 187,336 |  |  |  |
Long-term debt | $ 2,767,381 | $ 2,862,921 |  |  |  |
Credit Facilities [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis Point Fee | 0.0010 |  |  |  |  |
1.125% Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 0.01125% | 0.01125% | 1.125% |  |  |
1.625% Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 0.01625% | 0.01625% | 1.625% |  |  |
1.875% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 0.01875% | 0.01875% |  | 1.875% | 1.875% |
3.45% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 0.0345% | 0.0345% | 3.45% |  |  |
4.15% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 0.0415% | 0.0415% |  |  |  | 4.15%
4.50% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 4.50% |  |  |  |  |
5.45% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 0.0545% | 0.0545% |  |  |  | 5.45%
Unsecured Debt | 1.125% Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt | $ 610,800 | $ 554,900 |  |  |  |
Unsecured Debt | 1.625% Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt | 610,800 | 554,900 |  |  |  |
Unsecured Debt | Floating Rate Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt | 200,000 | 200,000 |  |  |  |
Senior Notes | 1.875% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt | 480,007 | 436,073 |  |  |  |
Senior Notes | 3.45% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt | 300,000 | 300,000 |  |  |  |
Senior Notes | 4.15% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt | 425,000 | 425,000 |  |  |  |
Senior Notes | 5.45% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt | 350,000 | 350,000 |  |  |  |
Commercial Paper |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt | 325,000 | 186,700 |  |  |  |
Variable-rate foreign bank loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt | 7,702 | 7,296 |  |  |  |
Finance lease obligations |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt | 59,181 | 59,524 |  |  |  |
Credit Facilities [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt | $ 223,900 | $ 0 |  |  |  |

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