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Debt (Tables) | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments |
|  |  | December 31,
| Interest rate |  | 2015 |  | 2014
Commercial paper | 1.1% |  | $ | 90,000 |  |  | $ | — |
Notes due March 2015 | 5.0% |  | — |  |  | 274,879 |
Notes due January 2016 | 4.75% |  | 370,914 |  |  | 370,914 |
Notes due September 2017 | 5.75% |  | 385,109 |  |  | 385,109 |
Notes due March 2018 | 5.6% |  | 250,000 |  |  | 250,000 |
Notes due May 2018 | 4.75% |  | 350,000 |  |  | 350,000 |
Notes due March 2019 | 6.25% |  | 300,000 |  |  | 300,000 |
Notes due November 2022 | 5.25% |  | — |  |  | 110,000 |
Notes due March 2024 | 4.625% |  | 500,000 |  |  | 500,000 |
Notes due January 2037 | 5.25% |  | 115,041 |  |  | 115,041 |
Notes due March 2043 | 6.7% |  | 425,000 |  |  | 425,000 |
Term loans | Variable |  | 150,000 |  |  | 130,000 |
Other debt |  |  | 15,758 |  |  | 16,000 |
Principal amount |  |  | 2,951,822 |  |  | 3,226,943 |
Less: unamortized discount |  |  | 5,288 |  |  | 6,653 |
Plus: unamortized interest rate swap proceeds |  |  | 22,463 |  |  | 31,716 |
Total debt |  |  | 2,968,997 |  |  | 3,252,006 |
Less: current portion long-term debt |  |  | 461,085 |  |  | 324,879 |
Long-term debt |  |  | $ | 2,507,912 |  |  | $ | 2,927,127 |
Schedule of Maturities of Long-term Debt | Annual maturities of outstanding debt at December 31, 2015 are as follows:
2016 | $ | 461,085 |
2017 | 535,277 |
2018 | 600,168 |
2019 | 300,168 |
2020 | 412 |
Thereafter | 1,054,712 |
Total | $ | 2,951,822 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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